National Society of Professional Engineers Award AAON 2011 Product of the Year

TULSA, OK--(Marketwire - Jun 1, 2011) - AAON, INC. (NASDAQ: AAON), a leading manufacturer of heating and cooling products, announces that its RQ Series High Efficiency Rooftop Unit has been recognized as the 2011 Product of the Year in the Large company category from the National Society of Professional Engineers (NSPE).

"Celebrating its 28th 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," said Richard Buchanan, P.E., chairman of the New Product Award Committee. "Winning products were chosen for their exceptional engineering research, design, and overall impact on our national economy. New and improved products stimulate the life and growth of our country. These benefits result from research and development to which engineers make their unique contribution. This competition recognizes the results of those efforts and the foresight of the companies whose aggressive policies bring new products to the marketplace."

The purpose of the NSPE New Product Award program is to recognize the full spectrum of benefits that come from the research and engineering of new products. These include added employment, economic development, strengthening of the nation's competitive position internationally, and contribution to the public's standard of living.

Norm Asbjornson, President and CEO of AAON, stated, "AAON products lead the market in reliability, quality, durability, serviceability and energy efficiency. The RQ Series High Efficiency Rooftop Unit, highlighted by the 2011 NSPE Product of the Year Award, offers many unique benefits including a unique fan control design for optimum energy savings, geothermal capability that works with a renewable energy source and ultra efficient cabinet construction that prevents heating and cooling dollars from being lost through unwanted heat transfer through the cabinet. There is no other product in the market today that offers the features or efficiency of the AAON RQ Series Rooftop Unit and we at AAON are honored to have it recognized by the National Society of Professional Engineers."

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.