I saw an advertisement for Colorado Discount Heating and Cooling in the newspaper. It quoted a price for 10 vents to be cleaned. When the guy came to do the work, he said I would be charged an extra $35 for the return vent in the floor. Three of my vents are screwed in the ceiling. The man that did the work claimed to be done in about 15 minutes. I never saw him with a ladder or any type of tools. When I asked him about the return, he said he had already done it. This was my first time using this company and it was definitely the last. I would not recommend them to anyone. I guess I got taken for that $35, because, I'm pretty sure he didn't do the return vent, or the three in the ceiling.