AAON, Inc. engineers, manufactures and markets commercial rooftop air conditioning, heating and heat recovery equipment, air conditioning coils, air handling and condensing units and chillers. Its products serve the commercial and industrial new construction and replacement markets. Manufacturers of rooftop units have historically focused on the initial cost of the unit, leaving life-cycle costs a distant second thought. We at AAON believe that the total life cycle cost of equipment is of ultimate importance. Therefore, AAON units are designed to not only have a reasonable first cost but also to maximize life expectancy, functionality, energy efficiency and maintainability while minimizing installation requirements. The AAON equation results in a quality unit with the best total value.