AAON Inc (AAON) will raise its semi-annual dividend by 12.4 percent of $0.18 per share in 2009. This follows a 20.0 percent dividend hike by the cooling and heating company in 2007.

AAON, Inc. 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, packaged outdoor mechanical rooms, air handling units, makeup air units, energy recovery units, condensing units, geothermal/water-source heat pumps and coils. The company's products serve the commercial and industrial new construction and replacement markets. AAON was incorporated on August 18, 1987 and has paid a dividend to shareholders every year since 2006.