The MRCOOL MCAEHWD10X1AA Signature Series Air Handler Heat Kit 10kW is an electric auxiliary heating kit designed for compatible MRCOOL Signature Series air handlers. It operates by converting electrical energy into heat through resistance heating elements, providing supplemental warmth when the heat pump requires additional heating capacity. Designed for HVAC systems using R454B refr... https://www.partshnc.com/mrcool-signature-series-heat-kit-mcaehwd10x1aa