Air conditioner coils are known as evaporator coils and condenser coils. An evaporator coil is used to change liquid refrigerant into gas after heat is absorbed. A condenser coil changes gas back into a liquid before pushing the heat outside.
The evaporator coil is used to transfer heat, which is one of the most important aspects of a heating or cooling system. Rather than adding cool air to the room, an air conditioner removes heat from the air and transfers it outside using the evaporator coil. After the refrigerant inside the coils evaporates, the coil serves as a heat receptor for air that travels across the coil from the blower. This coil has the ability to act as a "heat exchanger,” which can assist the HVAC system with heat in the winter and cooling in the summer. This feature is designed in dual or hybrid systems that allow the coils to act as both evaporation and condensation sites.
The condenser coil is located outside the unit, and it allows heat to dissipate after heated gas changes back to liquid form. Similar to an evaporator coil, the condenser coil also acts as a heat transfer component, but it directs heat in the opposite direction. The heat travels from the refrigerant through the coil and into the air outside with the help of exhaust fans.