ESCO Air Conditioning Practice Exam 2025 - Free AC Certification Practice Questions and Study Guide

The evaporator coil plays a crucial role in the heat exchange process within an air conditioning system. Situated inside the indoor unit, the evaporator coil is responsible for absorbing heat from the indoor air. When the refrigerant in the coil absorbs heat, it evaporates and transforms from a liquid to a gas, effectively cooling the air that is circulated by the air handler.

During this process, the heat absorbed from the indoor air is then transported to the outdoor unit, where it is expelled into the atmosphere through the condenser coil. This ongoing cycle of heat absorption and release is vital for the cooling function of the air conditioning system.

While the compressor, air handler, and thermostat all have significant roles in the functioning of the air conditioning system, they do not directly participate in the heat exchange process. The compressor compresses the refrigerant gas before it moves to the condenser, the air handler moves air over the evaporator coil and into the space being cooled, and the thermostat controls the temperature settings of the system. Therefore, the evaporator coil is the specific component that handles the heat exchange essential for cooling.