I started using Air Design around 5 years ago when they installed a new air conditioning unit in my home. Since then, I have them come out every spring to do a check up on the system to make sure that it's running smoothly. I like that they come when you need them to and I have never had a scheduling error with them. The technicians are nice people and do good work. I have no reason to ever look for another HVAC service company, Air Design does great.