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 upsell us! It’s so refreshing to find a company that cares more about its customers than the bottom line. And after the installation of our new AC and furnace units, they followed up and made sure everything was working well. We were so impressed with our experience that we switched our servicing to Delta T as well.