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A cooling system uses a liquid that moves around inside the air conditioning system. After burning off most of the heat in your home, the liquid moves to another part of the unit. This is where you see the condensation on the coils. It has to do this again to cool your home again. This process is known as the cycle of refrigerant. After a certain amount of time, the liquid will return to its original state. air curtain The use of an air curtain is an excellent way to conserve energy in a commercial building. It prevents conditioned warm air from escaping, thus conserving energy within a building. But the curtain's performance is affected by the drafts caused by exhaust systems and ventilation systems. Hence, it is important that the pressure of air on both sides of the curtain remain equal throughout its operation. Some manufacturers install heaters in the intake air. Commercial and retail settings are the most common application of an air curtain . They are installed above commer