We had our air duct system cleaned by Tru Tech 18 months ago, and they were great. TheIr prices very reasonable. They cleaned all of the ductwork and replaced all of our vents as well . The difference in the air was noticeable within 24 hours! Recently we noticed a register starting to hang away from the ceiling in our cathedral sloped ceiling. One call and they came out and found the problem, a screw had missed the intended hole in the frame, fixed it and were on their way, no charge. I love a company that stands by their work!! I would most definitely use them again and highly recommend them to friends and neighbors.