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Mini Split Installation

Home
Heat Pump
Mini Split System

The Smarter Way to Heat and Cool—Without Ducts

Need powerful, room-by-room comfort without ripping up walls or installing ductwork? Our expert mini split installation services bring you a seamless, energy-efficient solution that works year-round in Massachusetts.

We install mini split heat pump systems that keep you comfortable through sweltering summers and icy winters—with rebates, quiet performance, and flexible zone control.

Why Choose a Ductless Mini Split System?

Whether you're renovating, finishing a basement, or looking for targeted comfort without the cost of central AC, a ductless mini split system gives you:

  • Flexible zoning – control temps room by room
  • No ducts, no mess – ideal for older homes or additions
  • Quick, clean installs – most done in a day
  • Big savings – qualify for Mass Save® rebates and federal tax credits
  • ‍All-season comfort – with built-in heat pump technology

How We Install Mini Split Systems That Work for You

Expert Design + Precision Installation

We don’t just install mini split units—we design them for performance. Our team considers layout, sun exposure, and usage patterns to ensure every zone delivers the comfort you expect.

We Specialize in Mitsubishi Mini Split Solutions

As certified Mitsubishi Electric partners, we install the industry’s most trusted equipment. A Mitsubishi mini split is durable, reliable, and engineered for New England weather—with performance down to -13°F.

Energy Star Mini Split Systems That Save

Every ENERGY STAR mini split we install meets strict energy efficiency guidelines—translating into lower monthly bills, less environmental impact, and eligibility for maximum incentives.

Related Services

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Mini-Split Applications
Mini-Split Ductless
Mini-Split Ducted
Mini-Split Mixed

What Local Homeowners Are Saying

See how SumZero has helped local homeowners stay comfortable year-round with energy-efficient heat pump solutions.

Best company we've ever dealt with. From Paul on the first day to Sarai and Laura in the office and everyone else we had contact with to complete the installation of heat pumps, the whole experience was great. We would highly recommend them!
Google
Ellen Landau
My experience working with Sum Zero on purchasing and installing my Bosch heat pump exceeded my expectations. From sales thru to the installation everyone was professional, helpful and polite. I have only had the system one day. So far it is working great. 👍👍👍
Google
Joseph Rubino
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.
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Brian T.

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Let our experts design the right heating and cooling solution—customized for your comfort, your layout, and your energy goals. No pressure. Just clarity.

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