My husband and I recently moved into a house that was a foreclosure and the guest house had a strange smell. Even though we completely re-painted the walls, ripped and replaced the old carpet, ran the faucets, we couldn't figure out where the smell was coming from and it was very frustrating. John came out to our home to take a look and he was very knowledgable. He made suggestions about the steps we should take in getting rid of the smell and finding out where it was coming from, concluding that the gist of the smell was from underneath the stairway (in an un-vented closet). It also might have been combined with the fact that we put new carpet on the stairwell which had a new smell to it. Because we've only lived here 2 weeks, he recommended to wait and take some steps (de-humidifier under the stairs), airing out the place on a cool night when the humidity is low outside, etc. I'm happy to say that the smell is almost gone, and I probably would have spent hundreds of dollars on mold testing with another company, when it really wouldn't have helped or was not necessary. Granted, if the smell is still here in a few weeks and I sense that something still isn't right, I will be calling John to take further action in doing more investigating and perhaps testing. I'd highly recommend him.