How often should I have my air ducts cleaned?

Air duct cleaning can help

How often you need to have your air ducts cleaned depends on household conditions. Is there a lot of traffic in and out of the house, are there pets in the house, or does anyone have health/breathing issues? All these factors come in to play. Typically, a homeowner needs to have the air ducts cleaned every 3 to 7 years. The best way to determine this is to get a free video inspection of your ductwork.