Heating, Ventilation, and Air Conditioning (HVAC) Electrical Practice Test 2025 – All-in-One Resource for Exam Success!

Humidity percentage serves as a key indicator for air quality in an HVAC system for several reasons. High humidity levels can create an environment conducive to mold growth, dust mites, and bacteria, which can negatively affect indoor air quality and overall health. Maintaining optimal humidity levels (typically between 30% and 50%) is essential for comfort and to prevent moisture-related issues in buildings.

While other factors like temperature levels, airflow rate, and filtration efficiency are important in the overall performance and comfort provided by an HVAC system, they do not specifically indicate air quality in the same way humidity does. For example, temperature can affect comfort but does not measure contaminants or allergens, airflow rate is crucial for proper circulation but does not indicate the presence of indoor pollutants, and filtration efficiency is related to how well the system removes particles from the air rather than the overall quality of that air.