Air conditioning works by adding cold air into your house.

• A. True
• B. It exchanges heat with outside
• C. False
• D. It uses a heat pump to add cold air

Answer: (C)

Air conditioning cools by moving heat out of the indoors, not by introducing a stream of cold outside air. The system absorbs heat from the room as air passes over the evaporator coil, causing the refrigerant to evaporate and carry that heat outside to the condenser, where it’s released to outside air. The cooled air that returns to the room is the same air recirculated, just with heat removed. So, the idea that AC adds cold air from outside isn’t accurate—the cooling comes from heat transfer, not from bringing in a supply of cold outside air.