AAON Wins 2009 Product of the Year Award From NSPE

Market Wire, June, 2009

AAON, INC. (NASDAQ: AAON), a leading manufacturer of heating and cooling products, announces that its Digital Precise Air Control (D-PAC) rooftop unit has been recognized as 2009 Product of the Year from the National Society of Professional Engineers (NSPE).

"Innovation and research have always been the cornerstones of new product development, and engineers contribute significantly to both," said Richard Buchanan, P.E., chairman of the New Product Award Committee. "This prestigious award serves to not only recognize the engineering that goes into these new products, but also the forward-thinking ability and initiative of the companies who are bringing these products to light."

Celebrating its 26th year, the prestigious New Product Award competition recognizes companies whose pioneering vision and design bring new products to the marketplace, while highlighting the societal benefits of these new products. These benefits include a direct and unique impact on the public's safety, added employment, increased productivity, economic development, the strengthening of the nation's competitive position internationally, and a significant contribution to the public's standard of living.

Norm Asbjornson, President and CEO of AAON, stated, "AAON products lead the market in energy efficiency and environmental responsibility. The D-PAC system, highlighted by the 2009 NSPE Product of the Year Award, utilizes a combination of ozone friendly variable capacity refrigerant compression, return air bypass, and modulating hot gas reheat to control both building temperature and humidity. The combination of these components, with an AAON D-PAC controller optimizing the system, provides total temperature and humidity control under all conditions using the smallest amount of energy possible."

About NSPE

The National Society of Professional Engineers is the national society of licensed professional engineers from all disciplines that promotes the ethical and competent practice of engineering, advocates licensure, and enhances the image and well-being of its members. Founded in 1934, NSPE serves more than 45,000 members and the public through 53 state and territorial societies and more than 500 chapters. For more information, please visit www.nspe.org .

About AAON

AAON is engaged in the engineering, manufacturing, marketing and sale of 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, please visit www.aaon.com .

For Further Information: Sam Neale Ph: (918) 583-2266 Fax: (918) 382-6295