MRCOOL DIY-12-HP-WMAH-115D25-O Ductless Mini-Split Heat Pump Air Handler is an indoor HVAC unit designed to provide efficient air distribution for compatible ductless heating and cooling systems. It works by circulating indoor air across the evaporator coil, where heat is absorbed or released, delivering consistent cooling and heating when paired with a compatible outdoor heat pump. https://www.partshnc.com/mrcool-diy-5th-gen-wall-mount-air-handler-diy-12-hp-wmah-115d25-o