AAON Reports Record Sales and Earnings

AAON, Inc. (NASDAQ: AAON) today announced its operating results for the three months ended March 31, 2008, of $65.5 million in sales (up 12%) and $6.4 million of net income (up 2%), $0.35 per diluted share, compared to $58.6 million in sales and $6.3 million in net income, $0.33 per diluted share, a year ago.

Sales and net income after tax for the first quarter of 2008 were the highest of any first quarter in the Company's history.

Norman H. Asbjornson, President and CEO, stated that "The rise in sales was attributable to increases in both market share and prices. While earnings as a percentage of sales were near an all-time high, they were moderated by inflationary pressures resulting in net income before tax that was slightly lower than the same period a year ago."

Mr. Asbjornson said, "While we are pleased with the first quarter results, the balance of the year remains difficult to predict."

The Company will host a conference call today at 4:15 P.M. EST to discuss the first quarter results. To participate, call 1-877-857-6176.

AAON, Inc. is a manufacturer of air-conditioning and heating equipment consisting of rooftop units, chillers, air-handling units, condensing units and coils. Its products serve the new construction and replacement markets. The Company has successfully gained market share through its "semi-custom" product lines, which offer the customer value, quality, function, serviceability and efficiency.

Certain statements in this news release may be "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933. Statements regarding future prospects and developments are based upon current expectations and involve certain risks and uncertainties that could cause actual results and developments to differ materially from the forward-looking statements.