I was skeptical, but this turned out to be a really good experience. The initial audit was thorough, and they identified numerous issues…some of which I was not aware of. The guys showed up on time and were professional, clean and fast. The retest showed a 30% decrease in my air leakage, which was better than expected. I have noticed a significant decrease in drafting, and less variation in the temperature room to room and floor to floor. I think this was a great service. I wish I had done this three years ago when we bought the place.