MRCOOL MHK10P Signature Series 10 kW Packaged Unit Heat Kit is an electric heating accessory designed to provide supplemental or emergency heat for compatible packaged HVAC systems. It works by converting electrical energy into heat through integrated resistance heating elements, while the system blower distributes warm air throughout the building. https://www.partshnc.com/mrcoolr-signature-series-heat-kit-mhk10p