Regular indoor air quality testing is important for health, comfort, and productivity. Issues like carbon monoxide, mold, moisture, and volatile organic compounds can impact indoor air quality. The document recommends testing annually if no issues exist, or more frequently if symptoms are present, home changes were made, or odors are noticed. Maintaining proper ventilation, humidity control, cleaning, and HVAC system maintenance can improve indoor air quality between tests. Contacting an HVAC professional like Buzzell Plumbing, Heating & Air can help assess indoor air quality and ensure a healthy home environment.