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Meet the Team Behind the Mission

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Our Company
Our Leadership

Our Leaders

At SumZero, we don’t believe in titles for the sake of hierarchy — we believe in leadership that serves. The people below don’t just oversee operations — they solve problems, build teams, and protect the promises we make to customers.

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From the office to the warehouse to the field, these are the faces you can count on — the people who help make SumZero one of the most trusted heat pump companies in Massachusetts.

Leadership Team

Co-Owner
David Sampaio

David Sampaio

Co-Owner

Field-focused, results-driven, and committed to excellence on every project.

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Co-Owner
Ilija Crnobrnja

Ilija Crnobrnja

Co-Owner

Vision-led leader guiding our mission, marketing, and customer experience.

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Comfort Consultant
Paul

Paul

Comfort Consultant

Listens deeply, designs smart, and helps customers make informed decisions.

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Comfort Consultant
Rapha

Rapha

Comfort Consultant

Brings clarity and trust to every estimate — a straight-shooter and system thinker.

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Finance Manager
Keven

Keven X.

 Finance Manager

Keeps our books tight and our strategy sharp. Numbers with integrity.

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Executive Assistant & HR Manager
Marjory

Marjory

Executive Assistant & HR Manager

The glue behind the scenes — organized, dependable, and deeply caring.

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Project Manager
Jackson

Jackson

Project Manager

Makes the job flow — clear scheduling, clear expectations, and no loose ends.

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Warehouse Manager
Teran

Teran

Warehouse Manager

Keeps our gear, our people, and our inventory moving smoothly every day.

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Install Coordinator & Call Center Lead
Lara

Lara

Install Coordinator & Call Center Lead

Juggles logistics with heart — a calm voice and steady hand behind the scenes.

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Mass Save® & AR Coordinator
Sarai

Sarai

Mass Save® & AR Coordinator

Keeps the rebate process moving and the details buttoned up.

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Webmaster
Marcelo

Marcelo

Webmaster

Quietly powers our online presence — always improving, always refining.

Li
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Curious what it’s like to work with people who actually live by these values?

Want to learn more about the areas we serve? Discover our service area and see how close we are to helping you.
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What Local Homeowners Are Saying

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

A wonderfully professional team from beginning to end. David, the salesperson, was knowledgeable and clear in his explanation of the Mini-Split system. The installation team took extreme care to keep our house tidy, installing the system on a rainy day. They put down tarps throughout the house and they cleaned up completely, indoors and out. This company is clearly a customer-oriented group, eager to do quality work and to communicate with the homeowner. I'd give them six stars if I could!
Lauren S.
Paul had exceptional expertise and depth of knowledge for heat pump systems. He answered all of our questions patiently concerning a partial system. We reviewed our setup and possible options but in the end we agreed heat pumps did not make sense for us at this time. We would definitely circle back if we decide in the future to move forward with heat pumps.
frances avrin
Daniel J. fixed 2 leaks in our Fujitsu mini-split unit. He kept us informed throughout the repair and was very methodical and strategic in his approach to the fix. This made the repair project as painless as possible. Highly recommend. Besides the technical professionalism, Daniel is one of the most polished techs I’ve met, and I’ve been a homeowner for 30+ years, so I’ve met many good guys in the practical arts/home fix profession. But Daniel is one of the best I’ve hired.
D Claxton

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