The MRCOOL MDPHK-05 Universal DC Inverter Packaged Unit Heat Kit 5KW is an electric heating accessory engineered for compatible MRCOOL universal DC inverter packaged HVAC systems. It works by utilizing electric resistance heating elements to generate supplemental heat, which is then distributed through the system’s airflow to maintain indoor comfort during colder conditions. Commonly ... https://www.partshnc.com/mrcool-dc-inverter-packaged-unit-heat-kit-mdphk-05