The MRCOOL MCAEAMPSF18C21AA Signature Series is an 18,000 BTU split-system, multi-position air handler designed to deliver reliable indoor heating and cooling support. It operates by circulating return air across the indoor coil, where heat is absorbed or released through the refrigerant cycle, before distributing conditioned air through the ductwork. Using R-454B refrigerant, this ai... https://www.partshnc.com/mrcool-signature-series-multi-position-air-handler-mcaeampsf18c21aa