An air conditioner’s condenser is a component which turns gas into liquid via a cooling process. Warm gas in the form of refrigerant vapour from the compressor enters the condenser coils at the top end; as it is condensed, it drains down to the bottom of the coils and into a receiver unit.
The receiver unit holds any surplus liquid refrigerant. The condenser’s function in an air conditioner is to release the heat from the refrigerant to the air surrounding the coils. Split system air conditioners have a separate condenser unit located outdoors.