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.