I have been using Air Design on and off for around 30 years, so I have a long history with them. My main issue with them is that they don't have the best communication. I need them for my commercial properties and response time is very important. Sometimes I have to call them several times to verify they will be coming out to help my tenants. In general, the people are helpful and friendly. The technicians always send me a thorough report after the work is done. I am planning on sticking with them for a while.