The MRCOOL MCDP0018ANPA Signature Series 18K BTU 1.5 Ton Downflow Cased Evaporator Coil is a high-quality indoor coil designed for compatible split-system air conditioners and heat pumps. Installed in downflow HVAC applications, it works by absorbing heat from indoor air as refrigerant flows through the coil, delivering efficient cooling and improved comfort. https://www.partshnc.com/mrcool-signature-series-1-5-ton-downflow-cased-evaporator-coil-mcdp0018anpa