My experience with Windy City Air Conditioning and Heating was really good. He changed a couple of things on the outdoor unit that were super overdue. He really worked a lot on it. He actually gave me the diagnostic, changed 2 filters, cleaned the condenser, and did a couple other things as well. He was very specific in telling me what he was doing, which I appreciated. I signed up for premier club and I'm very happy with that service.