![]() The hot air is then expelled from the room and is again replaced by cooler air-conditioned air. ![]() The injected cooler air exchanges heat energy with the room walls and other heat-generating sources present in the room, which increases the air temperature. ![]() In this cooling example, hot air inside the room is vented out of the room and is replaced by cooler air from the air-conditioning unit. Traditionally, air-conditioning is done by cycling either cool or hot air into an indoor space. These units are commonly referred to as heating ventilation and air-conditioning systems or, in short, HVAC systems. ![]() Central heating and air-conditioning units are used in homes, offices and shopping malls for indoor climate control.
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