A humidifier is used in an HVAC system to control which aspect of indoor air quality?

The use of a humidifier in an HVAC system is specifically designed to control humidity levels within a space. Maintaining the appropriate humidity is crucial for comfort and overall indoor air quality. This is because humidity levels that are too low can lead to dry skin, respiratory issues, and increased static electricity, while excessively high humidity can foster the growth of mold and bacteria, and cause discomfort.

By introducing moisture into the air, a humidifier helps create a more balanced indoor environment. This not only improves comfort but also protects furniture, wooden structures, and various materials from damage caused by dry air. The correct functioning of a humidifier can therefore significantly enhance the quality of the indoor air by ensuring that humidity levels are kept within a healthy and comfortable range.