MRCOOL HCMP3642CFOA ProDirect Series 36–42K BTU Cased Coil is an indoor evaporator coil designed to improve the performance of compatible HVAC systems. It works by allowing refrigerant to absorb heat from indoor air as it passes through the coil, supporting efficient cooling and, when paired with a heat pump, effective heating. https://www.partshnc.com/mrcool-prodirect-series-cased-coil-hcmp3642cfoa