Today I had a service call to clean my furnace from ARS. The technician Gary was simply awesome!! I was a few minutes late and when I arrived he couldn't have been nicer or more understanding greeting me with a handshake and a smile. He diagnosed and fixed the problem very quickly and took the time to explain and show me what what the problem was. Overall, I would highly recommend ARS and advise you to request Gary Z in you live in the south suburbs of Chicago, he's the best!