For a few days we have had some problems with our AC, it was not working properly and not cooling our house so I called Cornerstone and they were happy to get me on the schedule right away! This isn’t the first time I have had to deal with them and they are always there within at least an hour from the the time slot I was scheduled in. For example, if I’m scheduled from 4-6 pm, they are there by 5pm and always give me a 30 min heads up. They are very friendly, informative and professional. I have an appt for this evening and I’m sure our encounter will be just as pleasant! I’d use them again and recommend them to any of my family and friends.