The MRCOOL MDPHK-05 Universal DC Inverter Packaged Unit Heat Kit 5KW is an electric heating accessory designed to provide supplemental heat for compatible MRCOOL packaged HVAC systems. It uses electric resistance heating elements to generate warm air when additional heating capacity is required. This heat kit is used with compatible packaged heat pump units and helps maintain comforta... https://www.partshnc.com/mrcool-dc-inverter-packaged-unit-heat-kit-mdphk-05