Coil cleaning is a key preventative maintenance task that helps HVAC systems operate efficiently. We’re here to help you understand the differences between evaporator and condenser coil cleaning, know how to determine when coils need to be cleaned, and understand a few basic safety practices for cleaning wet coils.

 How Debris Affects the Coils

Evaporator and condenser coils are vulnerable to issues, since they’re not only involved in moving air and removing moisture, but also due to their respective locations. For example, since the evaporator coils are inside the system, they are prone to bacteria, particulate and suspected microbial growth, and other particulate growth that can negatively affect the air quality inside a space, as well as the performance of the HVAC system. As for condensers, since they are outside, they may be susceptible to hail damage and various types of yard debris.

 When either coil is dirty, the system loses efficiency. For example, a clogged condenser coil expels less heat, which forces the system to work longer or harder. Inefficient performance such as that can wear out other parts of the system, potentially causing larger issues in the future.

 On the evaporator side, a dirty coil takes longer to cool a space, restricts the amount of air flow delivered, and inhibits water removal from the air, all of which can create moisture. Moisture can create excessive humidity, and that can lead to strange smells, microbial growth, and even affect building materials.