The MRCOOL HHK-15 ProDirect Series Top-Discharge Electric Heat Kit is an auxiliary heating component designed for compatible MRCOOL ProDirect air handlers and heat pump systems. It works by using electric heating elements to provide supplemental warmth when outdoor temperatures reduce heat pump efficiency, ensuring consistent indoor comfort. Ideal for residential HVAC systems, this he... https://www.partshnc.com/mrcool-prodirect-series-top-discharge-heat-kit-hhk-15