Which method can improve indoor air quality within HVAC systems?

Using air filters and UV lights is a well-established method for improving indoor air quality within HVAC systems. Air filters play a crucial role in trapping dust, allergens, and other particulate matter, preventing these contaminants from circulating throughout the living space. High-efficiency filters, such as HEPA filters, can capture very small particles, significantly enhancing the overall air quality in a home or commercial building.

In addition to air filters, UV lights can be integrated into HVAC systems to help eliminate bacteria, mold spores, and viruses present in the air and on surfaces within the system. The ultraviolet light works by disrupting the DNA of these microorganisms, effectively neutralizing them and preventing their reproduction. This combination of filtration and ultraviolet treatment helps create a cleaner, healthier indoor environment by reducing harmful pollutants and pathogens.

The other options do not effectively contribute to improving indoor air quality. Increasing temperature settings may actually exacerbate problems related to humidity and discomfort without addressing air cleanliness. Sealing all windows and doors can lead to increased indoor air pollutants if proper ventilation is not maintained, as it traps stale air and contaminants inside. Reducing ventilation rates can further compromise indoor air quality by limiting the exchange of indoor air with fresh outdoor air, which is essential for diluting indoor air pollutants.