In the evaporator coil of an air-cooled air conditioner,(Category: AC & Heat Pump) •   Freon cools as it changes from a gas to a liquid •   Freon changes from a warm liquid to a cool liquid •   Freon changes from a cool gas to a warm gas •   Freon cools as it changes from a liquid to a gas •  Freon heats up as it changes from a liquid to a gas

Freon cools as it changes from a liquid to a gas. In the evaporator coil of an air-cooled air conditioner: • Refrigerant (like Freon) enters the evaporator as a cold, low-pressure liquid. • As warm indoor air blows over the coil, the refrigerant: ◦ Absorbs heat from the air, ◦ Evaporates (changes from liquid to gas), ◦ Cools the air in the process. So, the refrigerant is cooling the surrounding air while it evaporates.