The MRCOOL MDPHK09D Universal Heat Kit is an electric heating accessory designed for compatible MRCOOL air handlers and packaged HVAC systems. It uses electric resistance heating elements to warm air as it passes through the air handler, providing supplemental heat when needed. This heat kit is suitable for heat pump systems that require additional heating capacity during colder condi... https://www.partshnc.com/mrcool-universal-9kw-heat-kit-mdphk09d