+ How often should I have the air ducts in my building cleaned?

Cotton GDS recommends you have your HVAC system inspected annually for cleanliness and your supply and return air ducts every two years. If a visible inspection shows that there’s a high level of build up in the air ducts or that particulate matter is being discharged from the vents, then an immediate cleaning of the air duct system is recommended as these particles could decrease air quality.