The MRCOOL MHK05H Signature Series Air Handler Heat Kit with Circuit Breaker is an electric heating accessory designed to provide supplemental heat for compatible HVAC air handlers. It installs inside the air handler and generates heat when additional indoor warmth is needed, while the integrated circuit breaker offers built-in electrical protection. Ideal for residential heating and ... https://www.partshnc.com/mrcool-signature-heat-kit-mhk05h