I have been a customer of Rocky Top Air for a long time. They come out twice a year to do the routine maintenance on my heating and air unit. They always do good work for me, and so good in fact, that I recommended them to two friends and neighbors of mine. What is so unique about that is, that my friends are engineers who specialize in making specialized vacuum equipment to check for leaks in heating and air systems. So they really know their stuff. They were very impressed by the services provided by Rocky Top Air, and that says a lot about the company!