The MRCOOL MVPHK10 VersaPro 2nd Gen 10kW Heat Kit is an electric supplemental heating accessory designed for compatible MRCOOL VersaPro and Hyper Heat 2nd Gen central ducted air handlers. Installed inside the air handler, its electric heat elements generate additional warmth that the blower distributes through the ductwork when extra heating is required. https://www.partshnc.com/mrcool-versapro-10kw-heat-kit-mvphk10