Condenser coils are used to reject heat from an air-conditioning or refrigeration system. Sometimes they are used with the intention to heat air streams. They are one of the four main components in the refrigeration or air-conditioning cycle. Refrigerant enters as a superheated gas and condenses in the coil tubes as the air is heated. The refrigerant leaves the coil as a liquid.

Some typical applications for condenser coils:
Air Conditioning
Refrigeration
Heat Rejection
Reheat
Comfort Heating