Our Service Area

We had a great experience with SumZero installing 6 minisplits and 2 condensers. Long story short, we initially went with a different HVAC company (never having met with SumZero), and that company strung us along for months (partly due to genuine supply chain issues). When installation day finally came they showed up and said they couldn't do the job. So back to the drawing board. We then met with 7 or 8 HVAC installers, most of whom we hadn't met with before. SumZero's quote was middle of the pack. Unlike everyone else who was fine maxing out the minisplit BTUs, SumZero very much cautioned against oversizing the units and now that I've learned more about these technologies I really appreciate their working to size the system correctly. They also split up our two zones in a smarter way than anyone else was proposing. The SumZero team that came on install day were among the nicest contractors we've worked with on any of our various house issues we've had. After install we were having a smell issue with a couple of our units. Our SumZero contact came by to check on the issue, and I so appreciated how he didn't try to gaslight me. The smell wasn't happening at first when he arrived and instead of saying "Well ok, I guess there's no issue!" he stuck around and seemed genuinely curious and motivated to figure out what was going on. He did eventually smell it. They sent their techs out promptly after that and discovered there was something that wasn't wired correctly that was causing units to fire at the wrong times which caused excess condensation, and they fixed it. For what it's worth, we discovered after picking SumZero's quote that some friends of ours used them and also had a good experience.

We just had SumZero do a full conversion for our home to heat pumps for heating and cooling. We had a lot of questions and worries about how this would go. From the first consultation SumZero was fast, responsive, and thoughtful in planning this project. They walked us through everything. Installation took only 2 days and the team was excellent and professional. I'm now sitting in a cool, quiet house without window units! They went above and beyond and we are super grateful to them. Highly recommend.

We had heat pumps installed through SumZero working alongside MassSave’s incentive programs. They were absolutely amazing to work with. Not only did they give us the best quotes but were also flexible on timing. Paul guided us through every small and large question we had and also made it a breeze to get our heat loan approved. once scheduled, Lucas and team were in and out in 2 days and treated our house with great respect and left their work areas spotless. Dayla made customer service experience very smooth when we ran into some technological glitches with our wireless thermostat and made sure that we had a speedy resolution. These folks are professionals through and through and I would not hesitate to recommend them to anyone in the future. Go team SumZero!