HVAC - EPA Certification Practice Exam 2026 - Free EPA Certification Practice Questions and Study Guide

The evaporator coil is responsible for absorbing heat from the indoors in an HVAC system. When the refrigerant enters the evaporator coil, it is in a low-pressure, low-temperature state. As warm air from the indoor environment passes over the evaporator coil, the refrigerant inside the coil absorbs this heat, causing the refrigerant to evaporate and turn into a gas. This process removes heat from the indoor air, resulting in a cooling effect. The cooled air is then circulated back into the living space.

The function of the evaporator coil is vital in the cooling cycle of air conditioning systems, enabling the system to effectively lower indoor temperatures. Understanding this process is key to comprehending how modern refrigeration and air conditioning systems work and the role of each component in maintaining a comfortable indoor environment.