"Found Amazon on thumbtack after buying a house in Mountain Brook that had cigarette smoke and pet odor and mold/mildew issues. Had them come out and do their thing before starting major renovations because I was considering taking this house down to the studs to have new drywall, floorboards, and hvac ducts even though these items look like they're in great condition and the house is only 50 years old - because the smell was so bad. But Amazon came and cleaned out hvac systems and ducts, treated all the walls, "scrubbed" the air, and sealed the floorboards and many of the walls. It took four guys about a week and the results are amazing. The only remaining odors in the house now are coming from the old musty cabinets which I told the Amazon guys to ignore because they are coming out anyways. Will update with follow-up review in summer/fall 2016 after we've lived there a month or two and it's been hot and humid...hopefully to confirm cigarette and pet odors have not returned (no pets or smokers in our household).