AAON Rooftop Units are engineered for performance, flexibility, and serviceability. AAON Rooftop Units can provide energy-efficient cooling and heating using the unit’s refrigeration circuit. Reversing the flow of the unit’s refrigeration circuits allows the indoor coil to be used as a heating coil. This is a more efficient method of heating than electric resistance heating because a heat pump can reject more heat to the space per the amount of energy used. Thus, the operating costs of heat pump heating are always less than the operating costs of electric resistance heating. Heat pump heating is also a more efficient method of heating than gas heating and, depending on the cost of electricity and natural gas or propane, heat pump heating can have less operating costs than gas heating.