I had bought a coupon towards duct cleaning from 360 Duct. 360 Duct was next to impossible to reach and did not return my messages. I even tried to get my money back, then I finally reached them. They were late, they missed an entire duct and the intakes. They told me that I needed the furnace and the A/C units cleaned too but I suspected they were shoddy given their lack of professionalism and not worth spending any more money on. They certainly were not trying to impress me. After I turned my furnace on, later that day, puffs of dust and dirt came out of the vents. I woke up the next morning with a terrible sore throat which turned into a cold. I decided to check Homestars and find the most reputable duct cleaner and have them come and do the whole system. Beware of the coupon deals, you get what you pay for and nothing more.