I called Dial4Duct to have my ducts and furnace cleaned and they were at my house within an hour and ready to go since they had techs in the area. Usman and Ali were top notch. Both were very professional, efficient, thorough, and extremely friendly. They were very informative and took their time to explain the process and what was being done at all times. The before and after pictures of my ducts and furnace tell it all. Like night and day - the caked on dust and debris prior to their cleaning took me by surprise. Once they finished and showed me the after pictures, I was amazed to be able to see the shiny metal of the ducts once again! Just imagining my family and I breathing all of that recycled dirt, dust, and debris from buildup over the years, makes me squeamish. They used a special agitator to suck the the dust out that I've never seen any other duct cleaner use, and from what I understand, if it's not used then the cleaners are just blowing your dust around. Great work - I'd definitely use them again! Check out my before and after pics.