TULSA, OK--(Marketwire - April 30, 2008) - AAON, INC. (NASDAQ: AAON). A question and answer session will follow a brief presentation by our President, Norman Asbjornson. The entire call should last about 45 minutes.

The call will cover:

 --    First Quarter Performance for the period ended 03/31/2008
 --    Recent Events
 --    Future Outlook

       Date of Call:   Wed. May 7, 2008
       Time:           4:15 p.m. (Eastern Time)
       Telephone #:    Toll Free 1-877-857-6176

       Rebroadcast (Available through May 13, 2008)

                       Toll Free:  1-888-203-1112
                       PIN Code:   4861075

AAON looks forward to your attendance at the call.

AAON is engaged in the engineering, manufacturing, marketing and sale of residential and commercial air conditioning and heating equipment consisting of standard, semi-custom and custom rooftop units, chillers, boilers, air handling units, make-up air units, heat recovery units, condensing units and coils.

Since the founding of AAON in 1988, AAON has maintained a commitment to design, develop, manufacture and deliver heating and cooling products to perform beyond all expectations and demonstrate the value of AAON to our customers. For more information visit www.aaon.com.

Contact Information: For Further Information: Jerry R. Levine Ph: (914) 244-0292 Fax: (914) 244-0295