3 Ways Humidity Impacts the Execution of Your HVAC Unit

If you live in a region that sees a great deal of humidity, the operation of your HVAC equipment can be severely impacted by it. This is because humidity has a direct impact on the evaporating coil and other components found inside your HVAC system. To learn more about how humidity affects your home’s HVAC unit, read on.

The Evaporative Coil

One way that humidity can have an impact on your home’s HVAC equipment is through the evaporative coil. The evaporative coil features a special design that looks similar to what you’d see in an open-top ice chest. As this part works to turn liquid water into water vapor, it also traps particles like dust or pollen that have blown in through the cooling system.

As a result of this, it’s common for HVAC units to suffer from both poor efficiency and reduced airflow as they work to filter out these particles as they go through the evaporative coil. This can lead to a number of problems, including mold growth on either the evaporative coil or some other area in your home, excessive dust buildup inside the HVAC unit that leads to air quality issues, and increased stress being put on your HVAC equipment that may lead to early damage.


Prolonged periods of high humidity levels also have a direct impact on what happens during wintertime. As you probably know, warm air holds more moisture than cold air, which means during cold weather months, there is less evaporation, so water droplets will not immediately evaporate like they would when conditioners are on. This can result in a build-up of moisture on the evaporative coil, which can freeze and cause your HVAC system to transport the refrigerant in the AC unit to the air that blows into your home. As this process takes place, moisture in the form of water droplets is created. When high humidity levels are present, these break down.

The Condenser Coil

Another key component that is impacted by humidity levels is the condenser coil. The condenser coil is located outside your home, and it’s responsible for transferring heat from the refrigerant in your HVAC system to the environment surrounding your home.

If humidity levels are high, the condenser coil will have an additional layer of protection against lower outdoor air temperatures being pulled into your home. This can result in discomfort for those living inside as it leads to a temperature disparity between what’s happening outside and what’s happening inside. It also means that your HVAC unit might not be able to dehumidify effectively, which can result in moisture buildup on one or more components inside the AC unit.

The Air Filter

Finally, one last way that humidity impacts your HVAC unit is through the air filter. Spores, dust, pollen, and other particles found around your home can clog your air filter and reduce the airflow that your HVAC unit can produce.

As a result, it’s important to regularly check and replace your air filter if you live in a region with high humidity levels. Failing to do so can lead to a number of problems, including:

  • Reduced efficiency from your HVAC unit as it works harder to push air through a clogged filter
  • Excessive wear and tear on your HVAC equipment
  • Increased energy usage as your system tries to compensate for the reduced airflow
  • Poor indoor air quality caused by dust and other particles being recirculated back into your home

As you can see, humidity levels have a direct impact on a number of key components in your home’s HVAC unit. For more information contact us today!