They did an outstanding job. The service was top notch. Was the among the best decisions I ever made for my home. Will only use them going forward for duct cleaning services. This is an industry that has been troubled with unscrupulous participants. Dave's company is accredited and is very thorough. They walk you through the process, provide status updates during the work, and then provide before & after photos so you can see what they did and the degree of it's effectiveness. If I could give them a 6th star, I would.