When to clean air ducts is as important as knowing why and how. Oftentimes, the task of cleaning the air ducts that carry cool or warm air into rooms is way down on your list of things to do. It is also possible that you don’t even know that it needs cleaning. Since the air ducts are placed inconspicuously, usually along the ceiling or in between walls, maintaining its cleanliness becomes tricky hence nobody wants to even think about it or nobody thinks that it needs to be done. Don’t worry you don’t have to do it yourself. There are professionals who provide air duct cleaning services.