We had a FANTASTIC experience with Cornerstone! We had a 14 year old unit, that by the looks of it had never been serviced in its life! Needless to say it was time for a new one. We first dealt with Chris who was great; even answered all my dumb questions because let’s face it who really knows anything about AC units (definitely not me). When it was time for install we had TJ and Mike come out as well as two other gentlemen. Not only did they install a great system and clean the ducts, but they also put down a new concrete slab, painted inside the air handler closet, cleaned up after themselves and much more. I especially liked that I was emailed every time someone new was coming to my home so I knew exactly who to expect. Oh and there customer service is incredible! I called on Saturday to the emergency service because our AC unit decided to die that day and was called immediately back and was scheduled for our install within hours. I will be using them again for sure!!! Thanks Cornerstone!!!