MRCOOL MHK05H Signature Series Air Handler Heat Kit is a 5 kW electric heating accessory designed to provide supplemental heat for compatible MRCOOL air handlers. The integrated heating elements convert electrical energy into heat, which is distributed through the air handler to warm conditioned spaces. A built-in circuit breaker provides electrical protection during operation. https://www.partshnc.com/mrcool-signature-heat-kit-mhk05h