MRCOOL MCAEAMPSF18C21AA Signature Series 18K BTU Split System Multi-Position Air Handler is an indoor HVAC unit designed to distribute conditioned air throughout a home or light commercial space. It works by circulating air across an evaporator coil, where heat is absorbed or released depending on the system mode, and then delivering the treated air through ductwork. https://www.partshnc.com/mrcool-signature-series-multi-position-air-handler-mcaeampsf18c21aa