We just used Windy City Air Conditioning for the first time recently and we were pleased with the service they provided us. We were having some issues with our A/C unit for quite a while and it finally gave out on us. They sent someone out the same day after we gave them a call, the technician took a look at the unit and let us know that it would be economically better to replace the whole unit instead of constantly repairing it. We took their word for it and decided to get a completely new unit. The installation went very smoothly and the unit is working as it should. I would use them again.