The evaporator coil's primary role is to:

The evaporator coil's primary role is to:

• A. Condense refrigerant into a liquid
• B. Compress the refrigerant to high pressure
• C. Absorb heat from the indoor air by evaporating the refrigerant
• D. Remove moisture from the air

Answer: (C)

The main idea is that the evaporator coil transfers heat from the indoor air into the refrigerant by causing the refrigerant to evaporate. As warm indoor air passes over the cold, low-pressure refrigerant inside the coil, heat moves into the refrigerant and the refrigerant changes from a liquid to a vapor. This heat absorption cools the air that’s blown back into the room. Condensation on the coil can occur as a side effect—which is part of dehumidification—but the primary function is removing heat from the indoor air through evaporation. The other parts of the cycle serve different roles: the condenser outside condenses refrigerant back into a liquid, and the compressor raises the refrigerant’s pressure.

The main idea is that the evaporator coil transfers heat from the indoor air into the refrigerant by causing the refrigerant to evaporate. As warm indoor air passes over the cold, low-pressure refrigerant inside the coil, heat moves into the refrigerant and the refrigerant changes from a liquid to a vapor. This heat absorption cools the air that’s blown back into the room. Condensation on the coil can occur as a side effect—which is part of dehumidification—but the primary function is removing heat from the indoor air through evaporation. The other parts of the cycle serve different roles: the condenser outside condenses refrigerant back into a liquid, and the compressor raises the refrigerant’s pressure.