The evaporator coil is the part of the indoor unit where the cooling actually happens. As warm air is blown over the cold coil, the refrigerant inside absorbs the heat, leaving the air cool and dry. Our coils feature advanced Blue Fin or Gold Fin coatings to prevent corrosion and improve drainage. A clean evaporator coil is essential for maintaining the Delta T and overall efficiency of your system. If the coil becomes frozen, it may be a sign of low refrigerant or restricted airflow from a dirty air filter. We offer replacement coils for various brands in our parts section. It is the core component of every wall mount and ceiling cassette.