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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
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David Sampaio

David Sampaio

Co-Owner

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

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Co-Owner
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Ilija Crnobrnja

Ilija Crnobrnja

Co-Owner

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

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Comfort Consultant
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Paul Jameson

Paul Jameson

Comfort Consultant

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

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Comfort Consultant
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Raphael Guimaraes

Raphael Guimaraes

Comfort Consultant

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

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Finance Manager
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Keven Xavier

Keven Xavier

 Finance Manager

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

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Executive Assistant & HR Manager
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Marjory Ramos

Marjory Ramos

Executive Assistant & HR Manager

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

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Project Manager
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Jackson Carvalho

Jackson Carvalho

Project Manager

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

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Warehouse Manager
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David Teran

David Teran

Warehouse Manager

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

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Customer Care and Lead Coordinator
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Lara Cosendey

Lara Cosendey

Customer Care and Lead Coordinator

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

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Mass Save® and Install Coordinator
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Sarai Kerr

Sarai Kerr

Mass Save® and Install Coordinator

Keeps the rebate process moving and the details buttoned up.

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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.

Excellent quality of work!
Google
Ulta Team
I called one of the large area companies who run a lot of TV ads to come out to service my A/C, heat pump and furnace. September was the earliest they could get out. 5 months. You gotta be kidding me. Called Sum Zero, what a difference. Arranged for a tech to come out within 4 days. Arrived on time, very professional tech (Neilson), explained everything and left with a delighted customer. Raving fan. From the office staff to the techs, Sum Zero outstrip the bigger name companies. Highly recommend Sum Zero. Great locally owned and operated company.
Yelp
Daren G.
Very professional and honest! The sum zero team did an excellent installation on new heating system. Highly recommend them!
Angi
Bruno A.

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