Delta T is very responsive, friendly and knowledgeable. They are also honest and told us which system would be best for our house (which happened to be the lower-cost system). They didn’t try to up sell us! It’s so refreshing to find a company that cares more about their customers than the bottom line. And after the install of our new AC and furnace units, they followed up and made sure everything was working well. We were so impressed with our experience we switched our servicing to Delta T as well.