The Duct Doctor advertised a coupon for $25.95 to clean my air ducts in my house. Before I knew it it was up to almost $600 due to 'mold'. Not only was I taken on that I made the mistake of paying up front. They then missed 3 appts with no call. To receive a one hour service it took from 4/11/11 to 5/9/11. No offer to reimburse and did not respond to my calls or emails requesting a refund of some sort. Do not use this company. I personally have no idea how this company can possibly stay in business.