AAON, Inc. is engaged in the engineering, manufacturing, marketing, and sale of premium air conditioning and heating equipment. It conducts its business through three segments: AAON Oklahoma, AAON Coil Products, and BASX. AAON Oklahoma segment designs, manufactures, sells, and services standard, semi-custom, and custom heating, ventilation, and air conditioning (HVAC) systems, designs and produces controls solutions for all of its HVAC units, and sells retail parts to customers through its two retail part stores in Tulsa, Oklahoma as well as online. AAON Coil Products segment designs and manufactures a selection of its standard, semi-custom, and custom HVAC systems. BASX segment provides product development design and manufacturing of custom engineered air handling systems, including data center cooling solutions, cleanroom HVAC systems, commercial/industrial HVAC systems, and modular solutions. Additionally, BASX designs and manufactures cleanroom environmental control systems.