SCHEDULE 14A
                     Information Required in Proxy Statement

                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

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      Rule 14a-6(e)(2))
[ X ] Definitive Proxy Statement
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[   ] Soliciting Material Pursuant to ss.240.14a-12

                                   AAON, INC.
            ---------------------------------------------------------
                (Name of Registrant as Specified in its Charter)

            ---------------------------------------------------------
     (Name of Person(s) Filing Proxy Statement if other than the Registrant)

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                                   AAON, INC.



                                    Notice of
                                 Annual Meeting
                                  May 19, 2009,
                                       and
                                 Proxy Statement








                                   AAON, INC.

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                           TO BE HELD ON MAY 19, 2009


         Notice is hereby given that the Annual Meeting of Stockholders of AAON,
Inc., will be held at 2440 South Yukon, Tulsa, Oklahoma, on Tuesday, May 19,
2009, at 10:00 A.M. (Local Time), for the following purposes:

         1.   To elect three Class III Directors, for terms ending in 2012; and

         2.   To transact such other business as may properly come before the
              meeting or any adjournment thereof.

         IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE
STOCKHOLDER MEETING TO BE HELD ON MAY 19, 2009.

         In accordance with new rules approved by the Securities and Exchange
Commission, we are providing this notice to our shareholders to advise them of
the availability on the Internet of our proxy materials related to our Annual
Meeting. The new rules allow companies to provide access to proxy materials in
one of two ways. Because we have elected to utilize the "full set delivery"
option, we are delivering our proxy materials to our shareholders under the
"traditional" method, by providing paper copies, as well as providing access to
our proxy materials on a publicly accessible Web site.

         Our Proxy Statement, including our Annual Report on Form 10-K, is
available at our website:  www.aaon.com

         We hope that you will be able to attend this meeting, but if you do not
plan to do so, please date, sign and return the enclosed Proxy as promptly as
possible.

                                           By Order of the Board of Directors



                                           John B. Johnson, Jr.
                                           Secretary

April 16, 2009



                                   AAON, INC.
                                2425 South Yukon
                              Tulsa, Oklahoma 74107

                                 PROXY STATEMENT

         This statement is furnished in connection with the solicitation by the
Board of Directors of AAON, Inc., for proxies to be used at our Annual Meeting
of Stockholders to be held on May 19, 2009, at the time and place set forth in
the Notice of Annual Meeting accompanying this Proxy Statement. Unless the
context otherwise requires, references herein to "AAON", "we", "us", "our" or
"ours" refers to AAON, Inc.

         Pursuant to provisions of our Bylaws and action of our Board of
Directors, the close of business on March 23, 2009, has been established as the
time and record date for determining the stockholders entitled to notice of and
to vote at this annual meeting. The stock transfer books will not be closed.

         The Directors nominated for election will be approved if, assuming a
quorum is present either in person or by proxy, a majority of the shareholders
voting, vote in favor of each Director.

         Stockholders of record on the record date are entitled to cast their
votes at the Annual Meeting in person or by properly executed proxy. The
presence, in person or by proxies, of thirty-three and one-third percent
(33-1/3%) of the Common Stock outstanding on the record date is necessary to
constitute a quorum at the Annual Meeting. If a quorum is not present at the
time the Annual Meeting is convened, we may adjourn or postpone the meeting.

         Abstentions and broker non-votes are counted as shares present in
determining whether the quorum requirement is satisfied. Abstentions are also
counted in the total number of votes cast with respect to a proposal and thus
have the same effect as a vote against the matter. Broker non-votes are not
counted as votes cast in the tabulation of votes on any matter brought before
the Annual Meeting.

         Proxies received in advance of the meeting may be revoked at any time
prior to the voting thereof, either by giving notice to the Secretary of AAON or
by personal attendance at the meeting.

         We have adopted a procedure approved by the SEC called "householding"
pursuant to which shareholders of record who have the same address and last name
will receive only one copy of our annual report and proxy statement unless one
or more of these shareholders notify us that they wish to receive individual
copies. Shareholders who participate in householding will continue to receive
separate proxy cards.

         Shareholders currently receiving multiple copies of our annual report
and proxy statement at their household can request householding by contacting
our transfer agent at 1-801-277-1400 or writing to Progressive Transfer Company,
1981 East Murray-Holladay Road, Suite 200, Salt Lake City, Utah 84117.
Shareholders now participating in householding who wish to receive a separate
document in the future may do so in the same manner. Those owning shares through
a bank, broker or other nominee may request householding by contacting the
nominee.

                                      -1-


         This Proxy Statement, the Notice of Annual Meeting and accompanying
proxy card, as well as our 2008 Annual Report (which includes our Annual Report
on Form 10-K for the year ended December 31, 2008), will be first mailed to
stockholders approximately April 17, 2009. The Annual Report on Form 10-K can
also be found at our website (www.aaon.com). Copies of exhibits omitted from the
enclosed Annual Report on Form 10-K are available without charge upon written
request to Kathy I. Sheffield, 2440 S. Yukon, Tulsa, Oklahoma 74107, or may also
be obtained at the Securities and Exchange Commission's website at www.sec.gov.

                 VOTING SECURITIES AND PRINCIPAL HOLDERS THEREOF

         As of March 23, 2009, (the record date), we had issued a total of
17,172,685 shares of $.004 par value Common Stock, our only class of stock
outstanding. Each share is entitled to one vote on all matters submitted to a
vote by stockholders.

         The following table sets forth as of March 23, 2009, the aggregate
number of our shares of Common Stock owned by each person known by us to be the
beneficial owner of more than 5% of our Common Stock:

                                               Number of shares       Percent
Name and address of beneficial owner                owned             of class
-----------------------------------------     ------------------     ----------

     Norman H. Asbjornson                         3,451,757 (1)         20.10
     2425 South Yukon
     Tulsa, Oklahoma 74107


     Royce & Associates, LLC                      1,517,821 (2)          8.84
     1414 Avenue of the Americas
     New York, New York 10019


     (1) Includes 9,000 shares held under stock options that are exercisable
         currently or within 60 days of the annual meeting. Mr. Asbjornson has
         sole voting and investment powers with respect to all shares
         beneficially owned by him.

     (2) This share ownership information was provided in a Schedule 13G dated
         January 23, 2009, which discloses that Royce & Associates, LLC,
         possesses the sole voting power and sole dispositive power of the
         reported shares.

                                      -2-


         The following table sets forth as of March 23, 2009, the aggregate
number of shares of our Common Stock owned of record or beneficially by each
current director, nominee for director, each person named in the Summary
Compensation Table (herein, "named executive officers") and all directors,
nominees for director and named executive officers as a group:

                                           Number of Shares         Percent
  Name of Beneficial Owner                    Owned (1)             of Class
                                                                    --------

    Norman H. Asbjornson                      3,451,757 (2)           20.10

    John B. Johnson, Jr.                         20,050 (3)             *

    Charles C. Stephenson, Jr.                  770,922 (3)            4.49

    Jack E. Short                                 9,384 (4)             *

    Paul K. Lackey, Jr.                           6,050 (5)             *

    A. H. McElroy II                              6,050 (5)             *

    Jerry R. Levine                              60,567 (6)             *

    Robert G. Fergus                              3,674 (7)             *

    Kathy I. Sheffield                           14,362 (8)             *

    David E. Knebel                              71,284 (9)             *

    Scott M. Asbjornson                         424,380 (10)           2.47

    Directors, nominees and named             4,838,480 (11)          28.18
    executive officers as a group
    (11 persons)
    --------------------------------
(1)  All shares are held beneficially and of record and the owner has sole
     voting and investment power with respect thereto, except as otherwise
     noted.
(2)  Includes 9,000 shares issuable upon exercise of stock options that are
     exercisable currently or within 60 days of the annual meeting, 700 shares
     of restricted stock that will vest within 60 days of the annual meeting,
     803 shares under AAON's 401(k) plan and 149,150 shares owned by his
     foundation.
(3)  Includes 9,000 shares issuable upon exercise of stock options that are
     exercisable currently or within 60 days of the annual meeting and 700
     shares of restricted stock that will vest within 60 days of the annual
     meeting.
(4)  Includes 3,000 shares issuable upon exercise of stock options that are
     exercisable currently or within 60 days of the annual meeting and 3,200
     shares of restricted stock that will vest within 60 days of the annual
     meeting.
(5)  Includes 3,200 shares of restricted stock which will vest within 60 days of
     the annual meeting.
(6)  Includes 1,500 shares held by Mr. Levine's IRA account, 750 shares held
     jointly by Mr. Levine and his wife, 1,000 shares issuable upon exercise of
     stock options that are exercisable currently or within 60 days of the
     annual meeting and 2,850 shares of restricted stock which will vest within
     60 days of the annual meeting.
(7)  Includes 111 shares under AAON's 401(k) plan, and 300 shares of restricted
     stock that will vest within 60 days of the annual meeting.
(8)  Includes 47,475 shares issuable upon exercise of stock options exercisable
     currently or within 60 days of the annual meeting and 7,787 shares under
     AAON's 401(k) plan, and 300 shares of restricted stock that will vest
     within 60 days of the annual meeting.
(9)  Includes 68,100 shares issuable upon exercise of stock options exercisable
     currently or within 60 days of the annual meeting and 2,584 shares under
     AAON's 401(k) plan, and 300 shares of restricted stock that will vest
     within 60 days of the annual meeting.
(10) Includes 11,100 shares issuable upon exercise of stock options exercisable
     currently or within 60 days of the annual meeting and 7,182 shares under
     AAON's 401(k) plan, and 300 shares of restricted stock that will vest
     within 60 days of the annual meeting.
(11) Includes 157,675 shares issuable upon the exercise of stock options that
     are exercisable currently or within 60 days and 15,750 shares of restricted
     stock that will vest within 60 days of the annual meeting by all directors
     and named executive officers.
*    Less than 1%.

                                      -3-


                              ELECTION OF DIRECTORS

General

         Our Board of Directors is comprised of seven members. Our Bylaws (the
"Bylaws") divide the Board of Directors into three classes having staggered
terms of three years each, with Classes I, II and III having terms expiring at
the Annual Meeting of Stockholders in 2010, 2011 and 2009, respectively. The
Bylaws provide that a stockholder may nominate a director for election at an
annual meeting if written notice is given to us not less than 60 and not more
than 90 days in advance of the anniversary date of the immediately preceding
annual meeting.

         It is intended that the names of the nominees listed below will be
placed in nomination and that the persons named in the proxy will vote for their
election. Each nominee has consented to being named in this Proxy Statement and
to serve if elected. If any nominee becomes unavailable for any reason, the
shares represented by the proxies will be voted for such other person, if any,
as may be designated by the Board of Directors. However, management has no
reason to believe that any nominee will be unavailable.


Nominees:
                     Class III -- For Term to Expire in 2012
                     ---------------------------------------

           Name                       Age                   Current Position
           ----                       ---                   ----------------
   Norman H. Asbjornson               73                 President and Director
   John B. Johnson, Jr.               75                 Secretary and Director
Charles C. Stephenson, Jr.            72                        Director


Directors Continuing in Office:

                         Class I - Terms Expire in 2010
                         ------------------------------

           Name                       Age                   Current Position
           ----                       ---                   ----------------
    Paul K. Lackey, Jr.               65                        Director
     A. H. McElroy II                 46                        Director

                         Class II - Terms Expire in 2011
                         -------------------------------

           Name                       Age                   Current Position
           ----                       ---                   ----------------
       Jack E. Short                  68                        Director
      Jerry R. Levine                 70                        Director

                                      -4-


Biographical Information

         Set forth below is a description of the background of each of our
current directors, our nominees for director and executive officers. The term of
office of each officer ends on the date of the Annual Meeting, subject to
extension upon reelection.

         Norman H. Asbjornson has served as President and a director of AAON
since 1989 and currently serves in the class of directors whose terms will
expire at the 2009 annual meeting of stockholders. Mr. Asbjornson also serves as
the President of AAON, Inc., an Oklahoma corporation ("AAON-Oklahoma"), AAON
Coil Products, Inc., ("ACP"), AAON Canada Inc. ("AAON Canada") and AAON
Properties Inc. ("AAON Properties"), all our wholly-owned subsidiaries.

         John B. Johnson, Jr., has served as Secretary and a director of AAON
since 1989, and currently serves in the class of directors whose terms will
expire at the 2009 annual meeting of stockholders. Mr. Johnson also serves as
the Secretary of AAON-Oklahoma, ACP, AAON Canada and AAON Properties. Mr.
Johnson has been engaged in the private practice of law in Tulsa, Oklahoma,
since 1961, and is a member of the firm of Johnson, Jones, Dornblaser, Coffman &
Shorb, which serves as our General Counsel.

         Charles C. Stephenson, Jr., has served as a director of AAON since
1996, and currently serves in the class of directors whose terms will expire at
the 2009 annual meeting of stockholders. From 1987 until January 2006, Mr.
Stephenson served as Chairman of the Board of Vintage Petroleum, Inc., a
publicly held company engaged in oil and gas production and exploration.

         Jack E. Short has served as a director of AAON since 2004, and
currently serves in the class of directors whose terms will expire at the 2011
annual meeting of stockholders. He is Chairman of our Audit Committee. Mr. Short
was employed by PricewaterhouseCoopers (formerly Coopers & Lybrand) for 29 years
and retired as the managing partner of the Oklahoma practice (Tulsa and Oklahoma
City) of the firm in June 2001. He serves on the Board of Directors of Waste
Services, Inc., a public company which is engaged in the non-toxic waste
collection business.

         Paul K. Lackey, Jr., was elected as a director of AAON in 2007, and
currently serves in the class of directors whose terms will expire at the 2010
annual meeting of stockholders. Between April 2002 and October 2005 Mr. Lackey
served as CEO and President of The NORDAM Group, a privately held company in
Tulsa, Oklahoma involved in the aerospace industry. Between October 2005 and
December 2008 Mr. Lackey served as the Chairman and CEO of The NORDAM Group.
Since January 2009 Mr. Lackey has served as the Executive Chairman of the Board
of The NORAM Group. Mr. Lackey also serves on the board of directors of Matrix
Service Company, a public company involved in the construction and energy
services industry.

         A. H. McElroy II was elected as a director of AAON in 2007, and
currently serves in the class of directors whose terms will expire at the 2010
annual meeting of stockholders. Since 1997 Mr. McElroy has served as President
and CEO of McElroy Manufacturing, Inc., a privately held manufacturing concern
based in Tulsa, Oklahoma.

                                      -5-


         Jerry R. Levine was elected as a director of AAON in 2008, and
currently serves in the class of directors whose terms will expire at the 2011
annual meeting. For the last 39 years, Mr. Levine has been a securities analyst.
From 1980 to 1991 Mr. Levine served as a member of the "Emerging Growth Group"
of Merrill Lynch Capital Markets, specializing in small and mid-sized companies.
In 1999 Mr. Levine formed JRL Advisors, which firm provides investor relations
services. Mr. Levine, through JRL Advisors, has provided investor and
shareholder relations services and advice to the Company since JRL Advisors'
formation.

         Robert G. Fergus, age 68, has served as Vice President of AAON since
1989. Mr. Fergus also serves as Vice President of AAON-Oklahoma, AAON Canada and
AAON Properties.

         Kathy I. Sheffield, age 56, became Treasurer of AAON in 1999 and Vice
President in 2002. She also serves as Vice President and Treasurer of
AAON-Oklahoma, AAON Canada and AAON Properties and as Treasurer of ACP. Ms.
Sheffield was our Accounting Supervisor from 1989 to 1992, when she became
Accounting Manager.

         David E. Knebel, age 63, joined AAON in May 2001 as Manager of
Technology and Training, before becoming Director of Sales and Technology in
December 2002 and Vice President, Sales and Technology, in August 2005. He is
responsible for management of AAON's sales force, parts and service departments,
and software development in support of product application and selection. From
January 2000 to May 2001, Mr. Knebel was Sales Manager for Climatec - New
Mexico, where he managed product application and sales for CES Group products,
AAON and additional product lines.


                           BOARD AND COMMITTEE MATTERS

         The business of AAON is managed under the direction of our Board of
Directors ("Board"). The Board of Directors met four times during 2008, and each
director participated in every meeting during the respective time he held his
position on the Board, with the exception that Mr. McElroy was unable to attend
one Board meeting. Mr. Anthony Pantaleoni was a member of the Company's Board of
Directors until he decided to not seek re-election at the Company's annual
meeting in May, 2008. Prior to that time, Mr. Pantaleioni attended all meetings
of the Board held in 2008. Mr. Levine was elected at the annual meeting in May
2008, and subsequent to his election, Mr. Levine attended all meetings of the
Board in 2008.

         Each director participated in at least 75% of all applicable committee
meetings held last year during the time he served on the Board. Actions taken by
the Board of Directors outside of Board meetings were consented to in writing by
a memorandum of action in lieu of a meeting, to which all incumbent directors
subscribed. Directors meet their responsibilities not only by attending Board
and committee meetings but also through communication with members of management
on matters affecting us.

         A description of the fees paid to the directors and members of the
Audit Committee and Compensation Committee can be found under "Executive
Compensation - Director Compensation", herein.

         Shareholders may communicate with the Board of Directors, including the
non-management directors, by sending a letter to the Board of Directors of AAON,
Inc., c/o Corporate Secretary, 2425 South Yukon, Tulsa, Oklahoma 74107. The
Corporate Secretary has the authority to disregard any inappropriate
communications. If deemed an appropriate communication, the Corporate Secretary
will submit the correspondence to the Board or to any specific director to whom
the correspondence is directed.

                                      -6-


         We encourage our directors to attend AAON's annual meetings of
stockholders and all current Board members attended the 2008 annual meeting.

         The Board has an Audit Committee, currently comprised of Mr. Short, Mr.
Lackey and (since his election to the Board in May 2008) Mr. Levine. Prior to
his decision not to run for re-election at the May 2008 annual meeting, Mr.
Pantaleoni was a member of the Audit Committee. Mr. Short is Chairman of the
Audit Committee and has been designated as its "financial expert" as defined by
SEC rules.

         The Audit Committee assists the Board in fulfilling its responsibility
for oversight of the quality and integrity of our accounting, auditing and
financial reporting practices. Among other things, the Committee is responsible
for: selecting and retaining our independent public accountants; preapproving
the engagement of the independent accountants for all audit-related services and
permissible, non-audit related services; reviewing in advance the scope and
focus of the annual audit; and reviewing and discussing with management and the
auditors our financial reports, the audited financial statements, the auditor's
report, the management letter and the quality and adequacy of our internal
controls. All of the members of the Board who have served on the Audit Committee
during 2008 have been determined by the Board to be "independent" as defined in
Rule 4200(a)(15) of the National Association of Securities Dealers listing
standards. The Audit Committee is governed by a written charter, a copy of which
is included as Appendix A to our definitive proxy statement for our 2008 annual
meeting. The "Audit Committee Report" for year 2008 is set forth below. The
Audit Committee met four times during 2008.

         The Board also has a Compensation Committee which is currently
comprised of Mr. Stephenson and Mr. McElroy. Prior to his decision not to stand
for re-election at our May 2008 annual meeting, Mr. Pantaleoni had also served
as a member of the Compensation Committee. Mr. Stephenson is the Chairman of the
Compensation Committee. All of the members of the Board who have served on the
Compensation Committee in 2008 have been determined by the Board to be
"independent" as defined in Rule 4200(a)(15) of the National Association of
Securities Dealers listing standards. The Compensation Committee met two times
during 2008. The responsibilities of the Compensation Committee are set out more
fully under "Executive Compensation", below. The Compensation Committee is
governed by a written charter, a copy of which is included as Appendix A to our
definitive proxy statement for our 2007 annual meeting.

         We do not have a nominating committee or charter for such a committee.
Our Bylaws provide that a stockholder may nominate a director for election at an
annual meeting if written notice is given to us not less than 60 and not more
than 90 days in advance of the anniversary date of the immediately preceding
annual meeting. On the occasions when vacancies have occurred in the Board, the
new directors have been unanimously approved by the other directors.

         If and when new vacancies occur in the future, the Board will consider
director nominees recommended by shareholders, in accordance with our Bylaws.
The Board does not have a formal policy regarding the consideration of,
procedures to be followed by, minimum qualifications of or process for
identifying or evaluating nominees recommended by shareholders. All director
nominees must be recommended for the Board's selection by a majority of its
independent directors and approved by a majority of the whole Board.

                                      -7-


                             Audit Committee Report

March 10, 2009

To the Board of Directors of AAON, Inc.:

         The Audit Committee oversees AAON's financial reporting process on
behalf of the Board of Directors. Management has the primary responsibility for
the financial statements and the reporting process including the systems of
internal controls. We have reviewed and discussed with management and with the
independent auditors the Company's audited financial statements as of and for
the year ended December 31, 2008.

         We have discussed with the independent auditors the matters required to
be discussed by Statement on Auditing Standards No. 61, Communication with Audit
Committees, as amended, by the Auditing Standards Board of the American
Institute of Certified Public Accountants.

         We have received and reviewed the written disclosures and the letter
from the independent auditors required by Independence Standards Board Standard
No. 1, Independence Discussions with Audit Committees, as amended, by the
Independence Standards Board, and have discussed with the auditors the auditors'
independence.

         Based on the reviews and discussions referred to above, we recommend to
the Board of Directors that the financial statements referred to above be
included in the Company's Annual Report on Form 10-K for the year ended December
31, 2008.

                                     Audit Committee of the Board of Directors

                                                       Jack E. Short, Chairman
                                                       Paul K. Lackey, Jr.
                                                       Jerry R. Levine

Code of Ethics

         We have adopted a code of ethics that applies to our principal
executive officer, principal financial officer and principal accounting officer
or persons performing similar functions, as well as our other employees and
directors. We undertake to provide any person without charge, upon request, a
copy of such code of ethics. Requests may be directed to AAON, 2425 South Yukon
Avenue, Tulsa, Oklahoma 74107, attention Kathy I. Sheffield, or by calling (918)
382-6204.

Transactions with Related Persons

         In 2008, we did not enter into any new related party transactions and
we do not have any preexisting related party transactions.

                                      -8-


         Our Code of Conduct guides the Board of Directors in its actions and
deliberations with respect to related party transactions. Under the Code,
conflicts of interest, including any involving the directors or any Named
Officers, are prohibited except under any guidelines approved by the Board of
Directors. Only the Board of Directors may waive a provision of the Code of
Conduct for a director or a Named Officer, and only then in compliance with all
applicable laws and rules and regulations.

Director Independence

         The Board has adopted director independence standards that meet and/or
exceed listing standards set by NASDAQ. NASDAQ has set forth six applicable
tests and requires that a director who fails any of the tests be deemed not
independent. In 2008, the Board affirmatively determined that Mr. Pantaleoni was
(during the period he served) and Mr. Levine is (from the time of his election)
independent. In addition, the Board affirmatively determined that Messrs
Stephenson, Lackey and McElroy are independent. Mr. Asbjornson does not qualify
as independent under the standards set forth below. The Board has determined
that Mr. Johnson should not be deemed independent, because he is a member of the
law firm that serves as General Counsel to the Company.

         Our director independence standards are as follows:

         It is the policy of the Board of Directors that a majority of the
members of the Board consist of directors independent of AAON and our
management. For a director to be deemed "independent," the Board shall
affirmatively determine that the director has no material relationship with AAON
or its affiliates or any member of the senior management of AAON or his or her
affiliates. In making this determination, the Board applies, at a minimum and in
addition to any other standards for independence established under applicable
statutes and regulations as outlined by the NASDAQ listing standards, the
following standards, which it may amend or supplement from time to time:

o    A director who is, or has been within the last three years, one of our
     employees, or whose immediate family member is, or has been within the last
     three years a Named Officer, cannot be deemed independent. Employment as an
     interim Chairman or Chief Executive Officer will not disqualify a director
     from being considered independent following that employment.

o    A director who has received, or who has an immediate family member who has
     received, during any twelve-month period within the last three years, more
     than $120,000 in direct compensation from us, other than director and
     committee fees and benefits under a tax-qualified retirement plan, or
     non-discretionary compensation for prior service (provided such
     compensation is not contingent in any way on continued service), cannot be
     deemed independent. Compensation received by a director for former service
     as an interim Chairman or Chief Executive Officer and compensation received
     by an immediate family member for service as a non-executive employee will
     not be considered in determining independence under this test.

o    A director who (A) is, or whose immediate family member is, a current
     partner of a firm that is our external auditor; (B) is a current employee
     of such a firm; or (C) was, or whose immediate family member was, within
     the last three years (but is no longer) a partner or employee of such a
     firm and personally worked on our audit within that time cannot be deemed
     independent.

                                      -9-


o    A director who is, or whose immediate family member is, or has been within
     the last three years, employed as an executive officer of another company
     where any of our present Named Officers at the time serves or served on
     that company's compensation committee cannot be deemed independent.

o    A director who is a current employee or general partner, or whose immediate
     family member is a current executive officer or general partner, of an
     entity that has made payments to, or received payments from us for property
     or services in an amount which, in any of the last three fiscal years,
     exceeds the greater of $200,000 or 5% of such other entity's consolidated
     gross revenues, other than payments arising solely from investments in
     AAON's securities or payments under non-discretionary charitable
     contribution matching programs, cannot be deemed independent.

For purposes of the independence standards set forth above, the terms:

     o    "affiliate" means any consolidated subsidiary of AAON and any other
          company or entity that controls, is controlled by or is under common
          control with AAON;

     o    "executive officer" means an "officer" within the meaning of Rule
          16a-1(f) under the Securities Exchange Act of 1934, as amended; and

     o    "immediate family" means spouse, parents, children, siblings, mothers-
          and fathers-in-law, sons- and daughters-in-law, brothers- and
          sisters-in-law and anyone (other than employees) sharing a person's
          home, but excluding any person who is no longer an immediate family
          member as a result of legal separation or divorce, death or
          incapacitation.

         The Board undertakes an annual review of the independence of all
non-employee directors. In advance of the meeting at which this review occurs,
each non-employee director is asked to provide the Board with full information
regarding the director's business and other relationships with us and our
affiliates and with senior management and their affiliates to enable the Board
to evaluate the director's independence.

         Directors have an affirmative obligation to inform the Board of any
material changes in their circumstances or relationships that may impact their
designation by the Board as "independent." This obligation includes all business
relationships between, on the one hand, Directors or members of their immediate
family, and, on the other hand, AAON and our affiliates or members of senior
management and their affiliates, whether or not such business relationships are
subject to any other approval requirements by us.

                                      -10-


EXECUTIVE COMPENSATION

Compensation Discussion and Analysis

         The following discusses the material elements of compensation awarded
to, earned by or paid to our principal executive and principal financial
officers, and our other three most highly compensated executive officers. These
individuals are referred to as the ("Named Officers") in this proxy statement.

         Our current executive compensation programs are determined and approved
by our Compensation Committee, after consideration of recommendations by the
principal executive officer, as to the other Named Officers. None of the Named
Officers are members of the Compensation Committee. The Compensation Committee
has the direct responsibility and authority to review and approve our goals and
objectives relative to the compensation of the Named Officers, and to determine
and approve (either as a committee or with the other members of the our Board of
Directors who qualify as "independent" directors under applicable guidelines
adopted by NASDAQ) the compensation levels of the Named Officers.

         Our current executive compensation programs are intended to achieve two
objectives. The primary objective is to enhance our profitability, and thus
shareholder value. The second objective is to attract, motivate, reward and
retain employees, including executive personnel, who contribute to our long-term
success. As described in more detail below, the material elements of our current
executive compensation program for Named Officers include a base salary,
discretionary annual bonuses, perquisites, our contributions to AAON's 401(k)
plan, "profit sharing" payments (made to all employees), discretionary stock
options and restricted stock awards.

         We believe that each element of the executive compensation program
helps to achieve one or both of the compensation objectives outlined above. The
table below lists each material element of our executive compensation program
and the compensation objective or objectives that it is designed to achieve.

                                      Compensation Objectives
Compensation Element                  Attempted to be Achieved
----------------------------------    ----------------------------------------

Base salary                           Attract and retain qualified executives
                                      Motivate and reward executives performance

Bonus compensation                    Motivate and compensate executives'
                                      performance
                                      Stay competitive in the marketplace

Profit sharing                        Motivate executives and all employees
                                      equally

Perquisites and personal benefits     Attract and retain qualified executives

Equity-based compensation - stock     Enhance profitability of AAON and
options and restricted stock          shareholder value by aligning long-term
awards                                incentives with shareholders'
                                      long-term interests

Retirement benefits - 401(k)          Attract and retain qualified executives
and health savings account            Enhance profitability of AAON and
                                      shareholder value by aligning long-term
                                      incentives with shareholders'
                                      long-term interests

                                      -11-


         As illustrated by the table above, base salary, perquisites and
retirement benefits are all primarily intended to attract and retain qualified
executives. These are the elements of our current executive compensation program
where the value of the benefit in any given year is not wholly dependent on
performance. Base salaries are intended to attract and retain qualified
executives as well as being linked to performance by rewarding and/or motivating
executives. Base salaries are reviewed annually and take into account:
experience and retention considerations; past performance; improvement in
historical performance; anticipated future potential performance; and other
issues specific to the individual executive. In an effort to attract and retain
qualified executives, we emphasize the need to provide executives with
predictable benefit amounts that reward the executive's continued service. Some
of the elements are generally paid out on a short-term or current basis, e.g.,
base salary and perquisites, while retirement benefits are generally paid out on
a long-term basis.

         There are specific elements of the current executive compensation
program that are designed to reward performance and enhance profitability and
shareholder value, and, therefore, the value of these benefits is based on
performance. Our discretionary annual bonus plan is primarily intended to
motivate and reward Named Officers' performance to achieve specific strategies
and operating objectives, as well as improved financial performance. Other
elements that satisfy the primary objective of executive compensation to enhance
profitability and shareholder value are through a mix of short-term or current
basis and long-term basis. Profit sharing, which is divided equally among all
employees, provides a short-term cash reward for quarterly profits, while the
Long-Term Incentive Plan ("LTIP") and 401(k) savings and investment plan align
performance to profitability and shareholder value over a longer term. This
proper mix of short-term and longer-term elements allows us to achieve dual
goals of attracting and retaining executives, while motivating and rewarding
executives to enhance profitability and shareholder value.

         The Compensation Committee sets fixed-amount base salaries and believes
that bonuses and equity compensation should fluctuate with AAON's success in
achieving financial, operating and strategic goals. The Committee's philosophy
is that we should continue to use long-term compensation to align shareholder
and executives' interests and should allocate a portion of long-term
compensation to the entire executive compensation package.

         We have, from time to time, at the request and for the benefit of the
Compensation Committee, retained an independent third-party executive
compensation consulting company (which provides no other services to us) to
provide general compensation expertise. We have previously utilized this
consulting firm for a comprehensive analysis of compensation for all executive,
engineering, sales, marketing, general and administrative positions. The
consultant generally gathers peer group information and provides the information
to the Compensation Committee, which is then used for proper benchmarking of our
compensation programs for executives and other employees. During 2008, we
utilized the firm of Pay Scale Business Solutions to consult with us regarding
the overall compensation structure of the Company.

                                      -12-


Current Executive Compensation Program Elements

Base Salaries

         Similar to most companies within the industry, our policy is to pay
Named Officers' base salaries in cash. A significant portion of the executive
compensation package is through base salaries. Effective June 1, 2008, the
Compensation Committee increased salaries for Named Officers by an aggregate of
$33,126 resulting in the following individual base salaries: Norman H.
Asbjornson -- $296,417, Robert G. Fergus -- $162,260, Kathy I. Sheffield --
$162,264, David E. Knebel -- $163,155 and Scott M. Asbjornson -- $146,900 for
the year ended December 31, 2008. In approving these executives' salary
increases, the Committee took into account certain factors including,
recommendations of the principal executive officer (except for himself), each
executives' individual experience and increased responsibilities and improved
performance for the Company

Annual Bonuses

         Our policy is to pay any discretionary annual bonuses to Named Officers
in cash. Annual discretionary bonuses provided to the Named Officers are largely
based on the recommendation of the principal executive officer. The Compensation
Committee may reduce or increase the size of the payout for each individual
Named Officer at its discretion. Cash bonuses were declared and paid out in July
and December 2008 for all Named Officers except for Norman H. Asbjornson, the
principal executive officer. Cash bonuses are not a significant portion of the
executive compensation package. The annual discretionary bonus is reported in
the "Bonus" column of the "Summary Compensation Table" for each Named Officer.

         In accordance with our profit sharing plan under which 10% of pre-tax
profit at each subsidiary is paid to all eligible employees on a quarterly
basis, Named Officers receive their proportionate amount of the profit-sharing
bonus in cash. The profit-sharing bonus is solely based on our profit and
divided among all employees equally. The profit sharing is reported in the "All
Other Compensation" column of the "Summary Compensation Table" for each Named
Officer if threshold reporting requirements were met (i.e. generally, if the
total value of all perquisites and personal benefits received by the Named
Officer not reported under any other column in the table exceed $10,000 in the
aggregate).

Perquisites

         We provide some Named Officers with certain perquisites and personal
benefits, including automobile related expenses. We utilize certain tax
advantages associated with perquisites and personal benefits as a way to provide
additional annual compensation that supplements base salaries and bonus
opportunities granted to Named Officers. Perquisites are reported in the "All
Other Compensation" column of the "Summary Compensation Table" for each Named
Officer if applicable and if reporting threshold requirements were met.

                                      -13-


Equity-Based Compensation

         Our policy is that the Named Officers' long-term compensation should be
directly linked to enhancing profitability and value provided to our
shareholders. Accordingly, the Compensation Committee grants equity awards under
our LTIP designed to link an increase in shareholder value to compensation; such
grants are largely based upon the recommendation of the principal executive
officer (except as to himself) based on the Named Officers' performance in the
prior year and his or her expected future contribution to our performance. Stock
option and restricted stock award grants are valued using the Black-Scholes
Model in accordance with SFAS 123(R) and are calculated as a part of the
executive compensation package for the year based on the amount of requisite
service period served. Non-qualified stock options and restricted stock awards
for Named Officers and other key employees generally vest ratably over 5 years.
The Compensation Committee believes that these awards encourage Named Officers
to continue to use their best professional skills and to retain Named Officers
for longer terms.

         Awards are granted to new key employees on their hire date. Other grant
date determinations are made by the Compensation Committee, which are based upon
the date the Committee met and proper communication was made to the Named
Officer or key employee as defined in the definition of grant date by SFAS
123(R). Stock option exercise prices are equal to the value of AAON stock on the
close of business on the determined grant date. We have no program or practice
to coordinate timing of grants with release of material, nonpublic information.

         The aggregate amount as determined under SFAS 123(R) recognized for
purposes of our financial statements for 2008, 2007 and 2006 with respect to
outstanding options and restricted stock awards granted to the Named Officers is
shown in the "Summary Compensation Table" below. The grant date fair value of
the options and restricted stock awards granted to the Named Officers in 2008,
2007 and 2006 as determined under SFAS 123(R) for purposes of our financial
statements is shown in the "Grants of Plan-Based Awards Table" below. The
"Grants of Plan-Based Awards Table" below provides additional detail regarding
the options and restricted stock awards granted to Named Officers in 2008, 2007
and 2006, including the vesting and other terms that apply to the options and
restricted stock awards.

Retirement Benefits - 401(k) Plan and Health Savings Account

         We provide a 401(k) plan for all eligible employees. We provide an
employer match of 50% of the employee's salary deferral up to the first 9% of
the employee's compensation. Prior to January 1, 2007, the Company matched 50%
of the employee's salary deferral up to the first 7% of compensation. AAON's
contribution is in the form of cash and directs the investment to acquire shares
of our common stock. We believe that our added contribution in AAON stock
encourages retention as well as increases value to the employee and shareholder
as our performance increases. We maintain a stock repurchase arrangement by
which employee-participants in our 401(k) savings and investment plan are
entitled to have shares of AAON stock in their accounts sold to us to provide
diversification of their investments. The amounts contributed by us to each
Named Officer under the 401(k) savings and investment plan are based on actual
contributions and the base salary of the employee, and are reported in the "All
Other Compensation" column of the "Summary Compensation Table" for each Named
Officer, if applicable, and if the threshold reporting requirements were met.
Our employees participate in a high-deductible heath savings plan wherein they
open a Health Savings Account. We provide a 1% match for employee contributions
to their Health Savings Account.

                                      -14-


Compensation Committee's Report on Executive Compensation (1)

         Among the duties imposed on our Compensation Committee under its
charter, is the direct responsibility and authority to review and approve our
goals and objectives relevant to the compensation of our Chief Executive Officer
and other executive officers, to evaluate the performance of such officers in
accordance with the policies and principles established by the Compensation
Committee and to determine and approve, either as a Committee, or (as directed
by the Board) with the other "independent" Board members (as defined by the
NASDAQ listing standards), the compensation level of the Chief Executive Officer
and the other executive officers. Since the decision of Mr. Pantaleoni not to
run for re-election as a director at our May 2008 annual meeting, the
Compensation Committee has been composed of the two non-employee directors named
at the end of this report, each of whom is "independent" as defined by the
NASDAQ listing standards.

March 10, 2009

         The Compensation Committee has reviewed and discussed with management
the disclosures contained in the Compensation Discussion and Analysis section of
this proxy statement. Based upon this review and discussions, the AAON
Compensation Committee recommended to its Board of Directors that the
Compensation Discussion and Analysis section be included in this proxy
statement.
                                Compensation Committee of the Board of Directors

                                            Charles C. Stephenson, Jr., Chairman
                                            A.H. McElroy II


(1) SEC filings sometimes "incorporate information by reference." This means we
are referring you to information that has previously been filed with the SEC,
and that this information should be considered as part of the filing you are
reading. Unless we specifically state otherwise, this Compensation Committee
Report shall not be deemed to be incorporated by reference and shall not
constitute soliciting material or otherwise be considered filed under the
Securities Act of 1933, as amended, or the Securities Exchange act of 1934, as
amended.

Compensation Committee's Interlocks and Insider Participation

         Messrs. Stephenson and McElroy were members of the Compensation
Committee during all of 2008. No member of the Compensation Committee is or has
been a former or current Named Officer of AAON or had any relationships
requiring disclosure by us under the SEC's rules requiring disclosure of certain
relationships and related-party transactions. None of our Named Officers
identified herein served as a director or a member of a compensation committee
(or other committee serving an equivalent function) of any other entity.

Compensation of Named Officers

          The "Summary Compensation Table" set forth below should be read in
connection with the tables and narrative descriptions that follow. The "Grants
of Plan-Based Awards Table", and the description of the material terms of the
nonqualified options and restricted stock awards granted in 2008, 2007 and 2006
that follows it, provide information regarding the long-term equity incentives
awarded to Named Officers in 2008, 2007 and 2006 that are also reported in the
"Summary Compensation Table". The "Outstanding Equity Awards at Fiscal Year End
Table" and "Option Exercises and Stock Vesting Table" provide further
information on the Named Officers' potential realizable value and actual value
realized with respect to their equity awards.

         We did not have any pension plans, non-qualified deferred compensation
plans or severance, retirement, termination, written or unwritten constructive
termination or change in control arrangements for any of our Named Officers for
the year ended December 31, 2008.

                                      -15-


                                                           Summary Compensation Table

                                                              Restricted
                                                                Stock         Option         All Other
           Name and                       Salary     Bonus    Awards (1)     Awards (1)     Compensation       Total
      Principal Position         Year       ($)       ($)        ($)*           ($)*             ($)            ($)
                                                                                         

     Norman H. Asbjornson
 President and Board Chairman    2008     291,667         -      3,954             -         49,684 (2)       345,305
                                 2007     278,766         -      3,179             -         48,653 (2)       330,598
                                 2006     265,849         -          -         3,886         45,200 (2)       314,935

       Robert G. Fergus
        Vice President           2008     159,658    21,000          -             -         13,525 (3)       194,183
                                 2007     153,512     6,000      1,303             -         13,575 (3)       174,390
                                 2006     145,841     4,000          -             -              -           149,841

      Kathy I. Sheffield
   Vice President/Treasurer      2008     159,661    24,000          -         3,197         15,281 (4)       202,139
                                 2007     153,512     9,000      1,303             -         12,622 (4)       176,437
                                 2006     145,841     6,000          -        14,444              -           166,285

       David E. Knebel
  Vice President, Sales and
          Technology             2008     159,307    24,000          -         5,370         12,698 (5)       201,375
                                 2007     151,455     9,000      1,303             -         11,074 (5)       172,832
                                 2006     143,837     8,000          -        14,444              -           166,281

     Scott M. Asbjornson
        Vice President
   AAON Coil Products, Inc       2008     146,900    36,831          -         3,197          9,523 (6)       196,451
                                 2007     141,194    30,459      1,303             -         10,266 (6)       183,222
                                 2006     135,577         -          -        14,444              -           150,021


-----------------------------
*Reflects three-for-two stock split effective August 21, 2007

(1) See discussion of assumptions made in valuing these awards in the notes to
our financial statements. Compensation costs are recognized for option and
restricted stock awards over their requisite service period.

(2) Consists of (i) a per capita share, the same as all other eligible
employees, of 10% of the pre-tax profit of AAON-Oklahoma; (ii) contributions to
our 401(k) plan by AAON in the amount of $5,663, $6,546 and $5,989 in 2008, 2007
and 2006, respectively; (iii) director fees in the amount of $19,800, $19,800
and $18,900 in 2008, 2007 and 2006, respectively; and (iv) payment of personal
car lease in the amount of $18,343, $17,934 and $17,641 in 2008, 2007 and 2006,
respectively. In 2007, the Company began matching contributions to a Health
Savings Account.

(3) Consists of (i) a per capita share, the same as all other eligible
employees, of 10% of the pre-tax profit of AAON-Oklahoma; (ii) contributions to
our 401(k) plan by AAON in the amount of $6,885 and $6,504 in 2008 and 2007,
respectively; and (iii) executive medical insurance. In 2007, the Company began
matching contributions to a Health Savings Account.

(4) Consists of (i) a per capita share, the same as all other eligible
employees, of 10% of the pre-tax profit of AAON-Oklahoma; (ii) contributions to
our 401(k) plan by AAON in the amount of $7,596 and $7,774 in 2008 and 2007,
respectively; and (iii) executive medical insurance. In 2007, the Company began
matching contributions to a Health Savings Account.

(5) Consists of (i) a per capita share, the same as all other eligible
employees, of 10% of the pre-tax profit of AAON-Oklahoma and (ii) contributions
to our 401(k) plan by AAON in the amount of $6,446 and $6,656 in 2008 and 2007,
respectively. In 2007, the Company began matching contributions to a Health
Savings Account.

(6) Consists of (i) a per capita share, the same as all other eligible
employees, of 10% of the pre-tax profit of AAON Coil Products and (ii)
contributions to our 401(k) plan by AAON in the amount of $7,611 and $7,332 in
2008 and 2007, respectively. In 2007, the Company began matching contributions
to a Health Savings Account.

                                      -16-


         We award stock incentives to key employees and the Named Officers
either on the initial date of employment or due to performance incentives
throughout the year. The 2008, 2007 and 2006 grants to Named Officers are
reported in the table below.



                                             Grants of Plan-Based Awards

                                                                      All Other                            Grant Date
                                            All Other              Option Awards:         Exercise or      Fair Value
                                          Stock Awards:         Number of Securities     Base Price of         of
                            Grant        Number of Shares            Underlying          Option Awards    Stock/Option
          Name               Date       of Stock or Units            Options(#)              ($/sh)          Awards
                                                                                             
  Norman H. Asbjornson     5/20/08            1,050                                                          20,339 (2)
                           8/22/07            2,000                                                          41,140 (3)
                           5/22/07            1,050 (1)                                                      20,202 (1)(4)
                           5/31/06                                      3,000 (1)            15.55 (1)       19,980 (1)(5)

    Robert G. Fergus       7/12/07            1,500 (1)                                                      31,665 (1)(6)

   Kathy I. Sheffield      3/10/08                                      3,000                16.96           21,330 (7)
                           7/12/07            1,500 (1)                                                      31,665 (1)(6)
                            5/8/06                                     15,000 (1)            18.43 (1)      123,750 (1)(8)

    David E. Knebel       10/17/08                                     10,000                15.35           65,200 (9)
                           3/10/08                                      3,000                16.96           21,330 (7)
                           7/12/07            1,500 (1)                                                      31,665 (1)(6)
                            5/8/06                                     15,000 (1)            18.43 (1)      123,750 (1)(8)

  Scott M. Asbjornson      3/10/08                                      3,000                16.96           21,330 (7)
                           7/12/07            1,500 (1)                                                      31,665 (1)(6)
                            5/8/06                                     15,000 (1)            18.43 (1)      123,750 (1)(8)

----------------------------
(1) All shares and prices have been adjusted to reflect stock splits.

(2) The fair value of these shares is $19.37 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(3) The fair value of these shares is $20.57 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(4) The fair value price of these options is $19.24 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(5) The fair value of these shares is $6.66 per share based on the Black-Scholes
pricing model. See discussion of assumptions made in valuing these awards in the
notes to our financial statements.

(6) The fair value of these options is $21.11 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(7) The fair value of these options is $7.11 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(8) The fair value of these options is $8.25 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

(9) The fair value of these options is $6.52 per share based on the
Black-Scholes pricing model. See discussion of assumptions made in valuing these
awards in the notes to our financial statements.

                                      -17-


Narrative Disclosure to Summary Compensation Table and Grants of Plan-Based
Awards Table

         A discussion of 2008 salaries, bonuses and long-term incentive awards
is included in "Executive Compensation."

         Named Officers are not separately entitled to receive dividend
equivalent rights with respect to each stock option, however dividends are paid
for restricted stock awards (retroactively upon vesting). Each nonqualified
stock option award described in the "Grants of Plan-Based Awards Table" above
expires on the tenth anniversary of its associated grant date and vests in equal
installments over the course of three years for Board members and five years for
executives. Norman H. Asbjornson's awards vest over a three-year period due to
his capacity as a director, excluding his May 22, 2007 restricted stock awards
that were granted to him in his capacity of an officer.

         The following table presents information regarding outstanding equity
awards as of December 31, 2008. All share numbers and prices have been adjusted
to reflect stock splits.


                                         Outstanding Equity Awards at Fiscal Year End

                                                   Option Awards                                     Stock Awards
                                                   -------------                                     ------------

                                                                                                                  Equity
                           Number of    Number of                                              Equity         Incentive Plan
                          Securities    Securities                                         Incentive Plan     Awards: Market
                          Underlying    Underlying                                         Awards: Number    Value of Shares
                          Unexercised  Unexercised\    Option                                of Unearned      of Stock That
                          Options (#)   Options (#)   Exercise                 Expiration    Shares That     Have Not Vested
          Name            Exercisable  Unexercisable  Price ($)   Grant Date      Date     Have Not Vested         ($)
          ----            -----------  -------------  ---------   ----------      ----     ---------------         ---
                                                                                             
  Norman H. Asbjornson        3,000                     13.60       5/25/04      5/25/14
                              3,000                     12.00       5/24/05      5/24/15
                              2,000        1,000        15.55       5/31/06      5/31/16
                                                                    5/22/07        N/A            700 (1)         14,616
                                                                    8/22/07        N/A          1,600 (2)         33,408
                                                                    5/20/08        N/A          1,050 (3)         21,924

    Robert G. Fergus                                                7/12/07        N/A          1,200 (4)         25,056

   Kathy I. Sheffield        16,875                      5.73        3/1/01       3/1/11
                             15,000                      9.68       2/21/03      2/21/13
                              4,500        3,000        10.82        4/6/05       4/6/15
                              6,000        9,000        18.43        5/8/06       5/8/16
                                           3,000        16.96       3/10/08      3/10/18
                                                                    7/12/07        N/A          1,200 (4)         25,056


    David E. Knebel          30,000                      6.65       5/31/01      5/31/11
                             22,500                      9.68       2/21/03      2/21/13
                              4,500        3,000        10.82        4/6/05       4/6/15
                              6,000        9,000        18.43        5/8/06       5/8/16
                                           3,000        16.96       3/10/08      3/10/18
                                          10,000        15.35      10/17/08     10/17/18
                                                                    7/12/07        N/A          1,200 (4)         25,056

  Scott M. Asbjornson         1,500        1,500        10.82        4/6/05       4/6/15
                              6,000        9,000        18.43        5/8/06       5/8/16
                                           3,000        16.96       3/10/08      3/10/18
                                                                    7/12/07        N/A          1,200 (4)         25,056

---------------------
(1) The restricted stock awards vest ratably over 3 years and will be fully
vested in May 2010.
(2) The restricted stock awards vest ratably over 5 years and will be fully
vested on August 22, 2012.
(3) The restricted stock awards vest ratably over 3 years and will be fully
vested in May 2011.
(4) The restricted stock awards vest ratably over 5 years and will be fully
vested on July 12, 2012.

                                      -18-


         The following table presents information regarding the exercise of
stock options by Named Officers during 2008. All shares and prices have been
adjusted to reflect stock splits.


                                  Option Exercises and Stock Vesting


                                                            Option Awards

        Name                       Number of Shares Exercised (#)     Valued Realized on Exercise ($)
                                                                          
Norman H. Asbjornson                          185,625                           2,826,394

Robert G. Fergus                                    -                                   -

Kathy I. Sheffield                             14,250                             244,643

David E. Knebel                                17,500                             237,150

Scott M. Asbjornson                            48,375                             516,264


         The following table sets forth information concerning our equity
compensation plans as of December 31, 2008. All shares and prices have been
adjusted to reflect stock splits.


                                          Equity Compensation Plan Information


                                                                                        Number of securities remaining
                                Number of securities to be       Weighted-average       available for future issuance
                                  issued upon exercise of       exercise price of       under equity compensation plan
                                   outstanding options,        outstanding options,    (excluding securities reflected
        Plan Category               warrants and rights        warrants and rights              in column (a))
-----------------------------   --------------------------     --------------------    -------------------------------
                                            (a)                         (b)                           (c)
                                                                                            

   Equity compensation plans              579,576                     $12.29                         729,538
approved by security holders (1)

 Equity compensation plans not
approved by security holders (2)                -                                                          -

             Total                        579,576                     $12.29                         729,538

----------------

(1) Consists of shares covered by the AAON 1992 Stock Option Plan, as amended,
and the 2007 LTIP.
(2) We do not maintain any equity compensation plans that have not been approved
by the stockholders.

Director Compensation

         Our directors are paid quarterly fees of $3,750 and attendance fees of
$1,200 if present in person at Board meetings or $750 if participating by
conference telephone call. Directors are paid attendance fees of $1,000 per
meeting for service on our Audit Committee and $750 per meeting for service on
the Compensation Committee (up to a maximum of five meetings per committee per
year) and the Chairman of the Audit Committee is paid an additional fee of
$1,750 per quarter and the Chairman of the Compensation Committee is paid an
additional fee of $750 per quarter. Prior to the adoption of our LTIP in 2007,
each director was granted 2,000 shares of non-qualified stock options each year.
In 2007, following the adoption of our LTIP, we adopted a policy of annually
granting each of our directors 700 shares of restricted stock (1,050 shares
following our 3 for 2 stock split in August 2007). We made our annual grants of
restricted stock awards in May 2008, at which time Messrs. Asbjornson, Johnson,
Stephenson, Short, Lackey, McElroy and Levine received restricted stock awards
for 1,050 shares of stock, which vest ratably over three years. Upon Mr.
Levine's election to the Board at the May annual meeting, he was granted a
restricted stock award for 7,500 shares, which vests ratably over three years.

                                      -19-


                                  Director Compensation Table

                                Fees
                              Earned or         Restricted
                               Paid in            Stock               All Other
                                Cash            Awards (1)              Comp.           Total
         Name                    ($)                ($)                  ($)             ($)

                                                                            
   John B. Johnson, Jr.         19,800             3,954    (2)(3)        -             23,754

    Anthony Pantaleoni           4,950                 -    (4)           -              4,950

Charles C. Stephenson, Jr.      23,100             3,954    (2)(3)        -             27,054

      Jack E. Short             30,800             3,954    (2)(5)        -             34,754

   Paul K. Lackey, Jr.          23,800             3,954    (2)(6)        -             27,754

    A.H. McElroy II             19,350             3,954    (2)(6)        -             23,304

    Jerry R. Levine              5,950            32,196    (2)(7)                      38,146

-----------------------
(1) See discussion of assumptions made in valuing these awards in the notes to
the Company's financial statements. All shares and prices were adjusted for
stock splits.

(2) Granted on May 20, 2008 with a grant date fair value of $19.37 per share.
Compensation costs are recognized over the requisite service period.

(3) As of December 31, 2008, 9,000 shares underlying non-qualified options were
outstanding, and 1,750 shares associated with restricted stock awards were
outstanding.

(4) As of December 31, 2008, there were no non-qualified options or restricted
stock awards outstanding following Mr. Pantaleoni's decision not to run for
re-election to the Board in May, 2008.

(5) As of December 31, 2008, 3,000 shares underlying non-qualified options
were outstanding, and 6,750 shares associated with restricted stock awards were
outstanding.

(6) As of December 31, 2008, 6,750 shares associated with restricted stock
awards were outstanding. Non-qualified options have not been granted during his
term as a Board member.

(7) As of December 31, 2008, 8,550 shares associated with restricted stock
awards were outstanding. Non-qualified options have not been granted during his
term as a Board member.

             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Based solely upon a review of Forms 4 furnished to us during our most
recent fiscal year, we know of no director, officer or beneficial owner of more
than ten percent of our Common Stock who failed to file on a timely basis
reports of beneficial ownership of our Common Stock as required by Section 16(a)
of the Securities Exchange Act of 1934, as amended, other than Jack Short, who
filed a single Form 4 late in 2008.

                         INDEPENDENT PUBLIC ACCOUNTANTS

         The Audit Committee has selected Grant Thornton LLP ("GT") as our
independent auditors for the fiscal year ending December 31, 2009.
Representatives of GT are expected to be present at the Annual Meeting with the
opportunity to make a statement if they so desire and to be available to respond
to appropriate questions.

                                      -20-


                              Fees and Independence

         Our Audit Committee has adopted a policy that requires advance approval
of all audit, audit-related, tax and other services performed by the independent
auditor. The following services were authorized by the Audit Committee.

         Audit Fees. GT billed us an aggregate of $344,900 and $344,000 for
professional services rendered for the audits of our financial statements for
the years ended December 31, 2008 and 2007, respectively, and reviews of the
related quarterly financial statements.

         All Other Fees.  No other fees were billed by GT to us during 2008 or
2007.

         The Audit Committee of the Board of Directors has determined that the
provision of services by GT described above is compatible with maintaining GT's
independence as our principal accountant.


                  STOCKHOLDER PROPOSALS FOR 2010 ANNUAL MEETING

         Stockholder proposals intended to be presented at the 2010 Annual
Meeting and to be included in our Proxy Statement must be received at the our
executive offices, 2425 South Yukon, Tulsa, Oklahoma 74107, no later than
December 18, 2009.

         However, a stockholder who otherwise intends to present business at the
2010 Annual Meeting of stockholders, including nominations of persons to our
Board of Directors, must also comply with the requirements set forth in our
Bylaws. The Bylaws state, among other things, that to bring business before an
annual meeting or to nominate a person for our Board of Directors, a stockholder
must give written notice that complies with the Bylaws to the Secretary of AAON
not less than 60 days nor more than 90 days in advance of the anniversary date
of the immediately preceding Annual Meeting. Thus, a notice of a stockholder
proposal or nomination for the 2010 Annual Meeting of stockholders, submitted
other than pursuant to Rule 14a-8 of the Securities Exchange Act of 1934, as
amended ("Exchange Act"), will be untimely if given before February 19, 2010, or
after March 18, 2010. As to any such proposals, the proxies named in
management's proxy for that meeting will be entitled to exercise their
discretionary authority on that proposal unless we receive notice of the matter
to be proposed between February 19, 2010 and March 18, 2010. Even if proper
notice is received on a timely basis, the proxies named in management's proxy
for that meeting may nevertheless exercise their discretionary authority with
respect to such matter by advising stockholders of such proposal and how they
intend to exercise their discretion to vote on such matter to the extent
permitted under Rule 14a-4(c)(2) of the Exchange Act.

                                      -21-


                                  OTHER MATTERS

         Management knows of no business which will be presented at the 2009
Annual Meeting other than to elect the directors for the ensuing year.

         The cost of preparing, assembling and mailing all proxy solicitation
materials will be paid by us. It is contemplated that the solicitation will be
conducted only by use of the mails. We will, upon request, reimburse brokers for
the costs incurred by them in forwarding solicitation materials to such of their
customers as are the beneficial holders of our Common Stock registered in the
names of such brokers.


                                          By Order of the Board of Directors

                                          /s/ Norman H. Asbjornson
                                          ------------------------
                                          Norman H. Asbjornson
                                          President/CEO

April 16, 2009

                                      -22-


                                                                                                                       
AAON, Inc.                                                           PROXY
                                            THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS.
2425 South Yukon
Tulsa, Oklahoma 74107      The  undersigned   stockholder  of  AAON,  Inc.,  a  Nevada  corporation,   hereby
                           constitutes  and appoints John B. Johnson,  Jr., and Charles C.  Stephenson,  Jr.,
                           and each of them,  with full power of  substitution,  as attorneys  and proxies to
                           appear and vote all  shares of stock of the  Company  standing  in the name of the
                           undersigned,  at the Annual Meeting of  Stockholders  of the Company to be held at
                           2440 South Yukon  Avenue,  Tulsa,  Oklahoma,  on Tuesday,  May 19, 2009,  at 10:00
                           A.M.  (Local  Time),  and at any  adjournment  thereof,  with all powers  that the
                           undersigned  would possess if  personally  present,  hereby  revoking all previous
                           proxies.


1.    Election of Directors:


FOR Norman H. Asbjornson for a term ending in 2012        [  ]       WITHHOLD AUTHORITY to vote for Norman H. Asbjornson        [  ]


FOR John B. Johnson, Jr. for a term ending in 2012        [  ]       WITHHOLD AUTHORITY to vote for John B. Johnson, Jr.        [  ]


FOR Charles C. Stephenson, Jr. for a term ending in 2012  [  ]       WITHHOLD AUTHORITY to vote for Charles C. Stephenson, Jr.  [  ]


2.    In their discretion, upon any other matters as may properly come before the meeting.


                                                                 (over)

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS
MADE, THIS PROXY WILL BE VOTED FOR EACH OF MANAGEMENT'S NOMINEES FOR DIRECTORS.

The undersigned hereby acknowledge(s) receipt of the Notice of the aforesaid Annual Meeting and the Proxy Statement accompanying the
same, both dated April 16, 2009.

Dated:                                        , 2009
         -------------------------------------



         ----------------------------------------------------------


         ----------------------------------------------------------

                                                                    (Please sign exactly as your name appears at left. When shares
                                                                    are held in the names of two or more persons, all should sign
                                                                    individually. Executors, administrators, trustees, etc., should
                                                                    so indicate when signing. When shares are held in the name of a
                                                                    corporation, the name of the corporation should be written first
                                                                    and then an authorized officer should sign on behalf of the
                                                                    corporation, showing the office held.)


                                                                               PLEASE COMPLETE, SIGN, DATE AND RETURN THIS
                                                                                           PROXY CARD PROMPTLY,
                                                                                       USING THE ENCLOSED ENVELOPE.


                                                                 (over)