What impact does high humidity have on HVAC air conditioning systems?

High humidity has a significant impact on HVAC air conditioning systems, primarily leading to increased cooling costs. When the air is highly humid, the air conditioning system has to work harder and longer to remove excess moisture in addition to cooling the air. This is because the system not only cools the air but also dehumidifies it to maintain comfortable indoor conditions.

As humidity levels rise, the air conditioning system uses more energy to remove this moisture, which can elevate electricity consumption and, consequently, operating costs. Additionally, high humidity can make occupants feel warmer, prompting them to set the thermostat at lower temperatures to achieve comfort, further increasing energy use.

In contrast, high humidity does not enhance cooling efficiency, nor does it reduce the need for ventilation or eliminate the need for filters. The need for proper ventilation remains critical to maintain good indoor air quality regardless of humidity, and filters are essential for trapping dust and contaminants, which is an important part of the overall health of the HVAC system.