They do a great job. We have used their services for several years for routine maintenance, and I never have any issues. Recently, I had called them because we heard a funny noise coming from our air conditioning unit, and I spoke with Ron to set up an appointment. That Saturday, we had guests over at our house, and the air conditioner completely stopped working. David, one of their technicians, responded very quickly, and he was at our home within a half hour. He was able to get the air conditioner up and running, and he was able to detect a Freon leak inside the unit. We have a follow-up appointment scheduled to take care of the leak, but there haven't been any issues with the performance of our air conditioner since David fixed it. I definitely recommend them!