This company is not like many other duct cleaning companies. Paul came with a high-tech camera to look 24 ft. down into a return duct to see if it was viable. He then vacuumed out an 8 ft. return vent that contained colouring books and dust from 30 yrs. ago - the other duct cleaning company just happened to miss this, twice. He also made an opening into my ductwork to check my evaporator on my air conditioner. I had been told previously by an HVAC company that there was rust and debris in there - Paul assured me there wasn't. It's so refreshing to find a company that is so trustworthy. With Paul's knowledge and honesty, I'd give him a rating of 11 if I could.