For their own peace of mind, home owners should get their heating an cooling systems cleaned by members of NADCA, who must comply with a strict Code of Ethics. Some homeowners have been taken by what’s known as “blow-and-go” air duct cleaning—but you don’t have to be. These companies charge what seems a nominal fee but do a very poor job. They may ask you to pay extra for unneeded services and even pretend to be members of NADCA.
Before you hire a business you should see their DC Rating score. visit here.