The MRCOOL UHK20 Universal Series Heat Kit with Circuit Breaker is an electric heating accessory designed to provide supplemental heat for compatible air handlers. When activated by the HVAC system controls, its heating elements convert electrical energy into heat, while the air handler blower distributes warmed air through the ductwork. Designed for use with compatible MRCOOL Univers... https://www.partshnc.com/mrcool-universal-series-20kw-heat-kit-uhk20