MRCOOL HHK-08 ProDirect Series Top-Discharge Heat Kit is an electric heating accessory designed to provide supplemental and emergency heating for compatible HVAC systems. It works by using electric resistance heating elements to generate heat, which is then distributed through the connected air handler and ductwork. Designed for use with MRCOOL ProDirect Series top-discharge air handl... https://www.partshnc.com/mrcool-prodirect-series-top-discharge-heat-kit-hhk-08