For dryer vents, watch for longer drying times, clothes that are hotter than usual when the cycle ends, or a burning smell. You might also notice the outside vent flap doesn’t open when the dryer runs, or there’s visible lint around the outside vent. For air ducts, signs include increased dust on surfaces even after cleaning, family members experiencing more allergies or respiratory issues, uneven heating or cooling in different rooms, or higher than usual energy bills. In Elk Grove’s dusty environment, you might also notice musty odors when your HVAC system starts up, or see dust blowing out of vents when the system kicks on. If it’s been more than 3-5 years since your last cleaning, it’s probably time regardless of symptoms.