I give the highest rating to R&D Heating, Cooling & Electric. All I know is that the man who comes here works the whole time. He seems to do a thorough job. He's the expert, I'm not. I don't have to worry about the air conditioner because the technician does a good job taking care of it for us. We've been using R&D Heating, Cooling & Electric for fifteen or twenty years now. We've been happy with their service and highly recommend them.