The MRCOOL MHK20P Signature Series Heat Kit is a supplemental electric heating accessory designed to provide additional heating capacity for compatible HVAC equipment. It works by converting electrical energy into heat through resistance heating elements, with the system blower distributing warm air throughout the conditioned space. Designed for use with compatible MRCOOL Signature Se... https://www.partshnc.com/mrcoolr-signature-series-heat-kit-mhk20p