The service at A1 Heating is definitely a five. I've been working with them for several months, now, and they've always been very knowledgeable and polite. They know what they're doing, and they treat me with respect, which I really appreciated. The cost of their service calls is a bit high, and they don't tell you before arriving, which I thought was kind of unreasonable, but other than that, my experience with them has been very good. Other than the lack of warning on the high cost for the service call, I would definitely recommend them to others!