The MRCOOL MHK15P Signature Series Packaged Unit Heat Strip is a supplemental electric heating accessory designed to provide additional heating capacity for compatible packaged HVAC units. It works by converting electrical energy into heat through resistance heating elements, while the packaged unit blower distributes warm air throughout the conditioned space. Designed for use with MR... https://www.partshnc.com/mrcoolr-signature-series-heat-kit-mhk15p