Consumers should also beware of “blow-and-go” air duct cleaning companies. These companies often charge a nominal fee and do a poor job of cleaning the heating and cooling system. These companies may also persuade the consumer to pay for unneeded services with and/or without their permission. (If you have knowledge of a practicing “blow-and-go” air duct cleaner, contact your local Better Business Bureau to report the company.)

Print and web advertising promise unrealistically low prices to book the service call. Once inside the door, you are presented with “new findings.” By the time they leave your home, the invoice bears no resemblance to the advertised price that attracted you in the first place.