The MRCOOL MHK15B Signature Series Modular Blower Heat Kit is an electric heating accessory designed to provide supplemental heat in compatible HVAC systems. It works with a compatible modular blower by converting electrical energy into heat, which is then distributed through the ductwork by the blower fan. The kit is intended for compatible MRCOOL Signature Series air handlers and mo... https://www.partshnc.com/mrcool-signature-heat-kit-mhk15b