What is a common cause of ice build-up on the evaporator coil?

Low refrigerant levels or poor airflow is indeed a common cause of ice build-up on the evaporator coil. When the refrigerant level is low, there may not be enough refrigerant circulating through the system to absorb heat effectively. This leads to a drop in the temperature of the evaporator coil below freezing, causing moisture in the air to condense and freeze on the coil.

Similarly, poor airflow can contribute to this issue as well. If there are obstructions such as dirty air filters, blocked ducts, or malfunctioning fans, the airflow over the evaporator coil is restricted. When there is insufficient air passing over the coil, the heat exchange process is compromised, leading to lower temperatures and potential icing.

Understanding these factors is critical for diagnosing and preventing issues related to ice build-up on evaporator coils, which can impact system efficiency and performance.