The MRCOOL MCAEHWD5X1AA Signature Series Air Handler Heat Kit 5kW is an electric auxiliary heat kit designed for compatible MRCOOL air handlers. It works by using electric resistance heating elements to provide supplemental warmth when the heat pump cannot meet indoor heating demands, especially during colder conditions. This heat kit is used with MRCOOL Signature Series air-handling ... https://www.partshnc.com/mrcool-signature-series-heat-kit-mcaehwd5x1aa