I saw an add with offer of duct cleaning for $49. They claimed to be a licensed company and when called to schedule appointment...the secretary of course, to get clients was possessional. Two technician show up and get started with this big machine that i doubt did any suction...just made noise and blew air. And seems they secretly know how to control the gauge system on the machine to show the duct of a 8 yr new house is not working efficiently!! So the lead tech comes and says the whole duct system is clogged up...we cannot proceed further... read full review »