The only reason I'm giving D & M Heating & Air Conditioning 4 stars instead of 5 is because I'm a firm believer that there's always room for improvement. We've used them a couple of times at our old house for cleaning and maintenance and my mother-in-law just had a furnace put in by them. The last job they did for us was installing a furnace and it was excellent. I can't complain, and I've already recommended them.