I had advanced come out and do a duct cleaning/ dryer vent/ heat exchanger cleaning at my house in brick, nj. After doing endless amounts of research on duct cleaning(because there are so many companies that are rip offs) I picked advanced. After reading reviews, years in business and certifications I felt good about my decision. Billy and Steve showed up on time and went over the process in depth(which was same way nadca stated, the correct way to do it). I than had some questions and he answered them in great detail. They both were very careful maneuvering through my house and were very professional! They showed me what they were sucking out of my ductwork and the dryer exhaust. After they left I felt a significant difference in the air and I am very happy with the service they provided! The truck vacuum was top of the line, as well as the technicians the company sent to my home. I would highly recommend advanced to family and friends out there! Hope this helps everyone else trying to pick a reputable duct cleaner!!!!!