ESCO Air Conditioning Practice Exam 2025 – The All-in-One Guide to Exam Success!

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Which component of the AC system removes heat from the indoor air?

Compressor

Evaporator coil

The evaporator coil is the component of the air conditioning system responsible for removing heat from the indoor air. This occurs through the process of evaporation, which involves the refrigerant inside the coil absorbing heat as it changes from a liquid to a vapor. As warm air from the indoor space blows over the evaporator coil, the heat from that air is transferred to the refrigerant, cooling the air before it is circulated back into the room. This cooling effect is essential for maintaining a comfortable indoor environment.

The evaporator coil operates under low pressure and is connected to the indoor unit of the system. The refrigerant within the coil is typically at a very low temperature, so it efficiently absorbs heat. The cooled air blown out from the coil lowers the overall temperature of the indoor space, demonstrating the critical function of this component in the air conditioning process.

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Circuit board

Expansion valve

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