We are set up on the bi-annual service calls with Windy City Air Conditioning & Heating. We have been using them for nearly nine years and very happy with them. We just had the technician out a couple of weeks ago to do the routine checkup and everything turned out just fine. We really like using Windy City Air Conditioning & Heating because all of the technicians are always so informative and helpful. They take the time to help you determine what needs to be fixed right away or what work can possibly wait. They keep us up-to-date with everything along the way. We will continue using the company as we feel that they are very reliable and helpful in every way. We always recommend them to people.