MRCOOL HCMP3642DFOA ProDirect Series 36–42K BTU Cased Coil is an indoor evaporator coil designed to enhance the efficiency of compatible HVAC systems. It works by circulating refrigerant through the coil to absorb heat from indoor air, providing efficient cooling and supporting heating operation when paired with a heat pump. https://www.partshnc.com/mrcool-prodirect-series-cased-coil-hcmp3642dfoa