I give Hartz Heating & Cooling Inc five stars plus across the board! This was my first time using them. Mike, the service technician, insulated my entire house, inside and out. Plus he installed a new heat pump which he recommended. He also put in cross-over ductwork with what I have set up. I'm keeping the whole house heated now. And I've already tested it out. It got really hot in here! I will use Hartz Heating & Cooling Inc again If I need something else, they'll be here. And they're so economical. I would tell a potential customer you would be dumb not to call. When I called, I found out we were both out of town. But what's funny is we were both in the same town. But he said he would be here by Friday. I was glad because my house was 40 degrees. It just worked out fantastic. And the reason I chose him was that I worked with his father. And I knew him as a teenager. Both Mike and his father, Mike, are professional and friendly. The son is who did the work. He was in and out quickly. I feel like I have a brand new house! I would recommend Hartz Heating & Cooling Inc to my family and friends. In fact, I already have. The gal whom I told is going to call them as soon as she finishes her Spring stuff.