Which maintenance task can improve indoor air quality?

Replacing old air filters regularly is a key maintenance task that significantly improves indoor air quality. Air filters in heating, ventilation, and air conditioning (HVAC) systems are designed to trap dust, allergens, pollutants, and other airborne particles. Over time, as these filters accumulate contaminants, their effectiveness diminishes, leading to poorer air quality and potentially exacerbating health issues for occupants.

By regularly changing the air filters, you ensure that the HVAC system operates efficiently, and it can effectively remove harmful particles from the air. This leads to cleaner, healthier indoor air, which is especially important for individuals with allergies, asthma, or other respiratory conditions. Moreover, maintaining clean filters can also enhance the overall efficiency of the HVAC system, resulting in energy savings and prolonging the life of the equipment.

Other options, such as painting walls or adjusting temperature settings, do not directly address or improve indoor air quality in the same manner as proper maintenance of air filters. Likewise, decreasing ventilation rates would actually reduce air exchange and worsen indoor air quality, making it essential to prioritize activities like replacing air filters for optimal health and comfort.