I recently had an issue with my central air system which was difficult to diagnose. I called up Comfort First Heating & Cooling, and they worked tirelessly until they found out the issue. They came out and checked, and re-checked my system. They wouldn't give up until they had fully diagnosed the problem I was having. They did not charge me until they found the problem and fixed it. It took a couple of days to get a part which was needed, but once it arrived, my central air system was up and running within a few hours. They were excellent, and the techs were always on time, friendly, and courteous. I will absolutely use them again.