A man and a woman standing in front of a house.
CLOSE

Boston’s Trusted Heat Pump Experts - Designed for Comfort. Built for You.

We install high-performance Air Source Heat pumps tailored to your home and lifestyle - leveraging Mass Save rebates and local expertise to get it right the first time.

A blue and white logo for a company.

The Truth About Heat Pumps – What You Need to Know

Uncover the facts about costs, rebates, and efficiency before making the switch.
Get expert insights and avoid common pitfalls

Download FREE E-Guide

Mass Save®
Concierge Service

Navigating the rebate process alone can be stressful—let our 1-on-1 Mass Save® Concierge Service guide you through every detail. With up to $10K in rebates, $0 down, and 0% financing for up to 84 months, we're here to help you explore all available options. Contact us today to get started—no pressure, just expert assistance.

Proudly Serving Massachusetts Communities

Explore our heat pump and HVAC service area to see if we’re in your town. We’re committed to delivering expert comfort solutions across dozens of local communities. View Full Service Area ›

Our Process

At SumZero Energy Systems, our 7-step process makes upgrading to a heat pump simple and stress-free. From consultation to installation and beyond, we guide you every step of the way—with clarity, care, and expert support.

Step
1
of
9
STEP

90-min Consultation & Site Survey

STEP

Custom Design & Proposal

STEP

Client Onboarding

STEP

Mass Save® Kickoff

STEP

Project Walkthrough

STEP

Installation Execution

STEP

Post-Installation Care

Over 1,800 Massachusetts Homes Transformed with Tailored Heating and Cooling Solutions

Every home is unique, and so is our approach. As licensed MassSave® Heat Pump Installers (HPIN), we specialize in designing and installing systems that perfectly fit your home. We guide homeowners through the entire process, ensuring they understand their new heat pump's installation, operation, and maintenance. With us, your search for the ideal heating and cooling solution ends, backed by expertise and commitment to your satisfaction.

Two white air conditioners are sitting outside of a house.
A black van with a Summit Express logo on the side.
Two white air conditioners with the letters M and R on them.
A man wearing a black hoodie with the words "Your Heat Pump Experts" on it.
A man is working on a machine with a wrench.
A man wearing a black shirt and a white apron is working on a window.
A white and black air conditioner is sitting outside.
A white house with blue trim and a blue door.
A bedroom with a bed and a window.
A white Mitsubishi air conditioner is sitting outside.
A man wearing a white shirt and black belt is working on a heating and cooling unit.
A white house with a brown roof and a white air conditioner.

Customer Testimonials

We Specialize in Happy Customers

Not Sure Where to Start? We’ll Guide You

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

Request FREE ESTIMATE