In early January 2021 I had Stanley Steemer clean my ducts because my very powerful furnace blower was putting dirt/dust all over my curtains, blinds and window sills as well as affecting my breathing. Their service was very expensive, they left my apartment filthy, did not take care not to and I have seen no results that it has accomplished anything. I spent $450 for this service which has accomplished nothing and I could have got the same results with $30 worth difusers which I have had to purchase anyway. I can't help but wonder what they were doing the for 3 hours they spent in my apartment. User's recommendation: Call someone else.