MRCOOL MHK10U Universal Series Air Handler Heat Kit with Circuit Breaker is an electric heating accessory designed to provide supplemental or backup heat for compatible air handler systems. It works by converting electrical energy into heat through integrated heating elements, while the built-in circuit breaker helps protect the system from electrical overloads. This heat kit is used ... https://www.partshnc.com/mrcool-10kw-universal-heat-kit-mhk10u