The MRCOOL HHK-10 ProDirect Series Top-Discharge Heat Kit – 10 kW is an electric auxiliary heating accessory designed for compatible MRCOOL ProDirect Series air handlers and packaged HVAC systems. It provides supplemental heat by converting electrical energy into warm air, helping maintain indoor comfort during colder weather when additional heating capacity is needed. https://www.partshnc.com/mrcool-prodirect-top-discharge-heat-kit-hhk-10