I have a new air conditioning unit, but it still needs to be checked out to stay in warranty, so I called Don't Sweat It Air and Heat, Inc. to do that for me. They checked the pressure on the unit, and then they checked the outside part of the system, and then the inside part. The service person was young, but he seemed like he knew what he was doing. I think they did a good job, and the price was reasonable! I think I will call them again next year to check it out for me!