AAON, Inc., together with its subsidiaries, manufactures and sells air-conditioning and heating equipment in the United States and Canada. Its products consist of rooftop units, chillers, packaged outdoor mechanical rooms, air handling units, makeup air units, energy recovery units, condensing units, geothermal heat pumps, self-contained units, and coils. The company markets and sells its products to retail, manufacturing, educational, lodging, supermarket, medical, and other commercial industries. AAON, Inc. sells its products through a network of manufacturers representatives and internal sales force. The company was founded in 1987 and is based in Tulsa, Oklahoma.