MRCOOL MDPHK-20 Universal DC Inverter Packaged Unit Heat Kit 20KW is an electric auxiliary heat kit designed for MRCOOL Universal DC Inverter packaged heat pump units in 4- and 5-ton applications. It uses electric resistance heating elements to provide supplemental heat when additional heating capacity is required during cold weather or peak demand. The kit enhances indoor comfort, su... https://www.partshnc.com/mrcool-dc-inverter-packaged-unit-20kw-heat-kit-mdphk-20