Dave from Cool Zone is very knowledgeable! He maintains both the air conditioner and the swamp cooler behind our store. He really knows what he is doing. In fact, the entire staff at Cool Zone knows what they're doing. It gives us great peace of mind at our workplace to know that we can call them up and explain our problem, knowing that they'll be there and fix everything the same day! I never worry about repairs. Dave has even come in on his day off to address one of our concerns with the A/C. I also use him for my air conditioning unit at home and feel the same peace of mind. I highly recommend Dave and the staff at Cool Zone to others!