MRCOOL DIY-09-HP-WMAH-115D25-O Ductless Mini-Split Heat Pump Air Handler is an indoor HVAC unit designed to deliver efficient heating and cooling for a single-zone ductless system. It works by drawing indoor air across the evaporator coil, where heat is absorbed or released, then circulating conditioned air throughout the space. https://www.partshnc.com/mrcool-diy-5th-gen-wall-mount-air-handler-diy-09-hp-wmah-115d25-o