MRCOOL HHK-05 ProDirect Series Top-Discharge Heat Kit is an electric heating accessory designed to provide supplemental or emergency heat in compatible HVAC systems. It works by converting electrical energy into heat through integrated heating elements and distributing warm air through the connected air handler. Designed for use with MRCOOL ProDirect Series top-discharge air handlers ... https://www.partshnc.com/mrcool-prodirect-series-top-discharge-heat-kit-hhk-05