Texas Air Authorities, Inc. had done some service for us a while back. I believe my wife hired them in and they sent a couple of technicians out to our home. At that time, they braised the copper tubing to enable the freon to act properly on our air conditioning unit and heat pump. They did a great job and we definitely would recommend them. A few months after we had them do the repair we wound up having to replace the entire system anyway since it was getting very old and worn down. We would definitely use Texas Air Authorities, Inc. again if ever we have the need. They give you excellent service.