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Did you know there is a national association that oversees duct-cleaning services? The National Air Duct Cleaners Association began in 1989. It is a non-profit association of companies involved with cleaning of central air systems. Part of the mission of this organization is to establish standards for the task at hand, a very important thing to have, especially in a society where the lawsuit is a way a of life.
There is a certification process required of any company before it can be associated with the NADCA. It is not overly complex, but the group does have standards. The official website (www.nadca.com) lists members and lets the consumer search for a certified company in the potential client's area. If you are considering using a duct cleaning service, you would do well to stick with a certified member of such an organization. If you develop a grievance of some kind with the cleaning company, you have greater recourse and an avenue to get your complaints heard, and you hire a company known to be held to specific standards and expectations of professionalism.