Avoid "Dirty" Duct Cleaners

Consumerreports.org Feb. 4, 2008

The scenario:  You get a flyer in the mail from a company offering to clean the air ducts at your home for only $99.  Intrigued by the low price, you contact the company and set up an appointment. 

When the company arrives at your house, the rep tries to sell you on a bunch of other services, including carpet cleaning or mold remediation, to improve the air quality inside your home.  If you don't bite at these invoice-increasing items, he gives your ducts a cursory cleaning before moving onto the next mark somewhere in your area.