After ten years of regular service on our AC/Heat unit, we decided to get a new Carrier that was a high efficiency unit. It was installed on April 22, 2015. As of today, May 16th, we have been very pleased. with it. We keep it on 79 F and it has worked well. Ben and his helper did a good job. We would certainly recommend Comfort Air Engineering and Primo Plumbing to anyone who needs regular service or a new high efficiency unit. Thanks, Joe Harber