Very knowledgeable. I never knew how important it was to clean my air ducts, or how important clean air ducts should be in general. Not only in my home, but in businesses as well. Great father and Son team. Fast, Friendly, and they get the job done THOROUGHLY. Oh, and they were also promoting a special on deep carpet cleaning too! Two birds with one stone. I was able to schedule online with them and received a follow up reminder the day before which I appreciated. Very professional and a breath of fresh air...literally lol. Highly recommended.