The MRCOOL MCAEHFD10X1AA Signature Series Multi-Position Air Handler Heat 10kW is an electric heat kit designed to provide reliable auxiliary heating for compatible MRCOOL Signature Series air handlers. It works by converting electrical energy into heat, delivering warm airflow through the air handler and duct system when additional heating is needed. https://www.partshnc.com/mrcool-signature-series-heat-kit-mcaehfd10x1aa