Windy City Air Conditioning & Heating were able to come out to us on a Sunday evening when our air conditioner broke. They were able to take care of the problem within four or five hours of when we initially called them, which was great because no one else was able to come out. From the time the guy arrived, to the time the guy left, he was able to fix the problem in under an hour. He was very polite and professional, and I would absolutely use them again.