I had some work done by Airsmiths Home Performance, where they retro-fit my system. They were replacing some old stuff in order to bring the unit to a higher working level. They did work which corresponded to what I wanted to be done, although it was not exactly what I thought was going to be done. Despite this, they did do a good job with the work performed. It just wasn't precisely what I had expected. I did have an issue though, where, during their work, they turned the heat all the way up on my water heater and didn't adjust it back to normal afterward. Thankfully no one was hurt. But aside from this, the work done was of good quality, and the results seem to be more or less positive. Because of my experience with Airsmiths, I will consider using them in the future, but I will compare with other companies first.