How does an evaporator coil function in an air conditioning system?

The evaporator coil plays a critical role in the cooling process of an air conditioning system. It functions by absorbing heat from the indoor air, which leads to the evaporation of the refrigerant within the coil. This occurs because the refrigerant in the evaporator coil is at a lower temperature than the air passing over it. As warm indoor air flows over the coil, the heat energy from the air transfers to the refrigerant, causing it to change from a liquid to a vapor phase. This absorption of heat cools the air that is then circulated back into the living space, effectively lowering the indoor temperature.

By facilitating the phase change of the refrigerant, the evaporator coil helps maintain a comfortable environment. This process is essential for the overall functionality of the air conditioning system, emphasizing the importance of the evaporator coil in the heat exchange process.