AAON Named to the Fortune 40: Best Stocks to Retire On

TULSA, OK--(Marketwire - June 11, 2009) - AAON, INC. (NASDAQ: AAON), a leading manufacturer of heating and cooling products, has been named to Fortune Magazine's 2009 "Fortune 40: Best stocks to retire on." AAON is a debt-free company and has consistently used available cash to boost its dividend and buy back stock.

"We are delighted and honored to be singled out by Fortune Magazine in this impressive list of companies. Our commitment to product innovation, energy efficiency, and quality has driven AAON in a consistent and profitable growth path as evidenced by our strong operating performance and balance sheet," said Norm Asbjornson, President and CEO.

The article highlights that as of June 11, 2009, AAON had a price to earnings ratio of 13, as well as, a 20% return on assets with $48 million of free cash flow.

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, contact: Jerry R. Levine, Investor Relations, (914) 244-0292 or visit AAON at www.aaon.com.

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