Boy, does this guy work hard! Spent 6 hours straight cleaning all of the vents in my 1888 sq ft house. Additionally he cleaned out the dryer vent all the way to the outside, the A/C condenser outside which had a lot of debris and he wrapped the condenser so that debris could not get back in. This house was rented for 12 years before I purchased it so I knew this had to be done. He takes before and after pictures of each vent for you to see. Of course this is a messy process especially if you haven't had this done for years but he cleans up thoroughly after himself. I thought the price was a bit high but I feel like my allergies are so much better since I had this done. I guess you get what you pay for!