Eversource Heat Pump Rebates in Massachusetts and Connecticut: Utility Incentives Beyond MassSave and Energize CT

Eversource serves over four million electric and gas customers across Massachusetts and Connecticut, and the utility administers the largest residential heat pump rebate programs in both states. Most homeowners know Mass Save and Energize CT by name — but those are program brands, and Eversource is one of the program administrators running them.

Add ConnectedSolutions on top, and the rebate stack changes.

You probably think of Mass Save and Energize CT as the two heat pump rebate programs that matter in southern New England. However, both are program brands — and Eversource is the program administrator running large portions of each, with overlay incentives that stack on top of the headline rebate.

That distinction matters when you stack incentives, because Eversource pays separately for two different things. One is the one-time equipment install rebate; the other is the annual ConnectedSolutions payment for demand-response participation.

Who Is Eversource And What Does The Utility Administer?

Eversource is New England's largest energy delivery company, providing electric and gas service across Massachusetts, Connecticut, and New Hampshire. The utility is a named Program Administrator under Mass Save in Massachusetts and a co-administrator with United Illuminating under the Energize CT umbrella in Connecticut.

Practically, when an Eversource electric customer receives a Mass Save heat pump rebate, the application moves through Eversource's portal even though the program branding says Mass Save. The same dynamic applies in Connecticut, where Eversource is responsible for the rebate dollars flowing to customers in its service territory.

The utility also runs ConnectedSolutions in both states, which is a separate, opt-in demand-response program — not a rebate. We unpack the broader stacking math in our rebate stacking application order guide.

How Much Are Eversource Heat Pump Rebates In Massachusetts?

Mass Save's residential heat pump rebates — administered in Eversource electric territory by Eversource — pay up to a published cap for cold-climate air-source heat pumps that fully replace fossil-fuel heating. The current published whole-home rebate cap is $10,000 per home, with partial-home rebates calculated per ton of installed capacity.

That whole-home rebate requires removing the existing fossil-fuel system; partial-home installations that keep gas, oil, or propane heat as backup pay the per-ton structure under a lower aggregate cap. The distinction is the lever most homeowners overlook.

Income-eligible households qualify for Mass Save's Enhanced Residential program, which raises the rebate substantially and may approach 100% of installed cost at the lowest income tiers. We cover the thresholds in our HEEHRA income tier guide; Mass Save Enhanced Residential and federally-funded HEEHRA are distinct programs with similar but not identical thresholds.

For a broader treatment of Mass Save beyond Eversource territory, see our Mass Save rebates guide. Eversource also pays a separate rebate for ground-source (geothermal) heat pumps, which we cover in air-source versus ground-source heat pumps.

How Much Are Eversource Heat Pump Rebates In Connecticut?

In Connecticut, Eversource and United Illuminating co-administer the Energize CT residential heat pump rebate, which currently publishes a higher per-home cap than Massachusetts for whole-home cold-climate installations. The published whole-home rebate reaches up to $15,000 for qualifying cold-climate equipment that fully displaces fossil-fuel heating.

That cap is conditional — equipment must meet the program's cold-climate performance specification, the installation must be permitted, and the contractor must be Energize CT participating. Off-list contractors do not unlock the rebate.

Connecticut also offers a zero-interest contractor-financed loan product known as the Smart-E loan, which stacks with the rebate. Eligible homeowners borrow installed cost minus rebate and repay over the loan term at promotional rates, subject to program-year terms.

What Is ConnectedSolutions And How Does It Stack On Top?

ConnectedSolutions is Eversource's residential demand-response program, available in both Massachusetts and Connecticut. The program pays customers an annual incentive for allowing the utility to remotely throttle qualifying devices — heat pumps, batteries, EV chargers — during peak demand events.

For heat pumps specifically, ConnectedSolutions pays a per-ton or per-event incentive across a defined summer cooling season. The dollar amount changes year over year and is set by program filings with each state's regulator.

ConnectedSolutions stacks because it is structurally a different payment — one-time installation rebate from the energy efficiency program, recurring demand-response payment from the grid program. The same heat pump can earn both, provided the equipment is compatible with the program's controls.

Eligible equipment must support remote utility control, typically through a smart thermostat or manufacturer cloud API. Older heat pumps without compatible controls qualify for the install rebate but not the demand-response payment.

How Do Eversource Rebates Compare Between Massachusetts And Connecticut?

The two states differ on rebate ceiling, income-eligible structure, and contractor network rules. The table below summarizes the differences as of the current program year.

Connecticut's higher equipment rebate cap partially reflects the state's slower historical pace of electrification and higher electric retail rates, both of which the program is structured to offset. Massachusetts's lower equipment cap is paired with a deeper income-eligible tier through Enhanced Residential.

If you straddle the state line — a vacation home in one state, primary residence in the other — the rebate follows the property's service territory, not the homeowner's tax domicile.

How Do Eversource Rebates Stack With Federal Incentives?

The federal 25C Energy Efficient Home Improvement Credit covers a portion of heat pump installation cost annually, subject to IRS caps. We covered the 2025 program changes in what happened to 25C in July 2025.

Practically, the stacking order matters. Eversource pays the install rebate first; the homeowner files 25C on the post-rebate basis the following tax year.

We walk through this sequence in our 25C versus HEEHRA decision tree. HEEHRA — the state-administered IRA point-of-sale rebate program for low-to-moderate income households — is structurally separate from Mass Save Enhanced Residential and Energize CT's income-eligible structure.

What Equipment Qualifies For The Eversource Cold-Climate Rebate?

Both Mass Save and Energize CT require AHRI-certified cold-climate air-source heat pumps that meet specific HSPF2 and capacity-at-low-temperature thresholds. The performance requirement reflects each state's design temperature — Massachusetts winters drop to single digits, Connecticut shoreline less so.

The published qualified-product list filters to equipment proven to maintain rated capacity at low ambient. We cover the sizing math in cold-climate heat pump sizing and the defrost cycle sizing nuance that affects nameplate accuracy.

The choice between mini-split and ducted central also affects rebate path — both qualify, but the partial-home versus whole-home distinction often determines the cap. We cover that decision in mini-split versus central heat pump.

How Do I Apply For An Eversource Heat Pump Rebate?

The application flow is contractor-driven in both states. The participating contractor submits the rebate paperwork to Eversource (Mass Save) or Eversource/UI (Energize CT) on the homeowner's behalf, with payment issued after installation verification.

For Mass Save in Eversource electric territory, the typical sequence is energy assessment first, contractor quote second, rebate approval third, install fourth, rebate payment fifth. Some rebate dollars come directly to the homeowner; others are credited against the install invoice.

For Energize CT, the sequence is similar but often runs through the Smart-E loan in parallel for homeowners financing the install. The loan offset and the rebate are processed separately even though they apply to the same job.

How Does The Eversource Rebate Compare To Neighboring States?

Vermont, New Hampshire, and Maine each run distinct programs through their own utilities or state energy offices. We cover Vermont specifically in Vermont heat pump rebates; Eversource New Hampshire customers are subject to a separate NH program structure outside the Mass Save and Energize CT umbrellas.

The HEEHRA rollout schedule also varies by state. Our HEEHRA state-by-state status guide tracks current implementation, including Massachusetts and Connecticut where applicable.

Total return on a New England heat pump conversion — fuel savings, install rebate, demand-response payment, federal credit — is summarized in whole-home electrification ROI.

What Should I Verify Before I Buy?

Three things change every program year and should be verified directly with Eversource or the program portal before signing a contract. First, the published rebate amount for the current program year — caps shift annually.

Second, the qualified product list — equipment that qualified last year may not this year if performance thresholds tightened. Third, the contractor's current participation status — contractors drop out of the participating network periodically, which can invalidate the rebate path mid-project.

Definitions And Background Information

These short answers cover the questions readers ask after the main breakdown.

This article is for informational purposes and is not financial, tax, legal, or contracting advice.

Rebate amounts and program rules change annually — consult Eversource, your state's energy office, a licensed HVAC contractor, and a tax professional before acting.