They installed all my heating and a/c in my new home, they also installed an on demand hot water system. Not only were there recommendations correct, the savings on my propane bill has cut in half. I'm not kidding about that. They are professional and aren't there to gouge you. They tell you straight up what is the best and then they let you make the decision.
The service is excellent, with very reasonable prices. I would recommend them to anyone.