How can dirty coils impact HVAC system performance?

Dirty coils can significantly impact the performance of an HVAC system, primarily by restricting airflow. When the coils are covered in dirt, dust, or debris, their ability to transfer heat effectively is compromised. This reduced heat exchange means that the system has to work harder to reach the desired temperature, leading to decreased efficiency.

As airflow becomes restricted, the overall capacity of the HVAC system to cool or heat the air diminishes, resulting in longer run times and increased energy consumption. This not only affects comfort by delivering uneven temperatures throughout the space but also puts additional strain on the components of the system, potentially leading to premature wear and tear.

In addition to airflow issues, increased humidity levels may occur in some situations, as the system struggles to effectively dehumidify the air when the coils are not operating optimally. However, it is the restriction of airflow that is the primary concern directly tied to dirty coils. Other choices suggest improved performance aspects, which contradict the fundamental principles of HVAC system operations.