My hot water heater went out and the way my system works, not hot water then no heat. They were able to come to my home in a couple of hours and get it started. Knowing it could only be a temporary fix (it has happened before), I decided to replace the hot water heater. They were able to get it in one day. It was replaced without any issues. A few years ago, they replaced my furnace without issues. I will look to them when it is time to replace the a/c unit outside.