Complete guide to Mass Save rebates for Somerville homeowners in 2026 — heat pumps, insulation, solar, and battery storage, with exactly how each one works.
A dense Boston-adjacent city with an active municipal Green New Deal push, served by Eversource.
$8,500
Heat Pump rebate
$750
Water Heater rebate
Varies
EV Charger rebate
Quick quiz
Quick quiz: home energy in Somerville
Questions about Somerville, from the data behind this page. Tap an answer to see why.
Somerville is served by Eversource, so its homeowners, landlords and renters can all use Mass Save. The city is packed with two- and three-family houses. That makes the landlord side of Mass Save worth a look: owners of 1–4 unit buildings have their own assessment path. If every owner in the building takes part, insulation can be covered at more than the usual 75%. Tenants can also book a no-cost assessment for their own unit.
Tight lots and shared walls matter when you plan a heat pump. Outdoor units need a spot that meets setback rules, and older buildings often share one electrical service. Ask your installer early about panel capacity, since Eversource handles any service upgrade. Nearby, Belmont runs a town-owned light plant, so Mass Save's electric offers don't reach it. If you heat with gas, Mass Save lists heat pump rebates for gas-to-heat-pump switches through your gas account.
Mass Save funds nearly all residential energy rebates across Massachusetts, including Somerville. All amounts below are in US dollars.
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🔥 Heat Pump
Up to $8,500
$2,650/ton, capped at $8,500 for whole-home systems (partial-home systems can add up to $1,000 in weatherization and sizing bonuses). Income-qualified: up to $16,000 (air-source) or $25,000 (ground-source). Only R-32 or R-454B refrigerant systems qualify — R-410A heat pumps are no longer eligible as of January 1, 2026.
Mass Save may cover ventilation when it's needed as part of a weatherization project. Ask during your home energy assessment; we couldn't confirm a standalone amount.
Locked-in production payment for a fixed term once enrolled.
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🔌 Battery Storage
ConnectedSolutions pay-for-performance
No upfront Mass Save rebate. ConnectedSolutions pays you each year for letting the utility use your battery at peak times (MassCEC example: about $1,375/yr for a 5 kW battery), plus the SMART storage adder if paired with solar.
Schedule your free Mass Save home energy assessment
Get quotes from Mass Save-participating contractors in Somerville
Work is installed
Contractor or you file the rebate paperwork with Mass Save
Rebate is paid after Mass Save approves it. Some offers (like heat pump water heaters) are instant; mailed rebates can take months, so keep copies of everything
Get your number: Pick your city in our free rebate finder to see your Somerville-specific rebate estimate.
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Renting or living in a condo in Somerville? Here's what applies to you
Most of the rebate figures above assume you own a single-family home and control the whole building. That's not most of Somerville, one of the densest cities in Massachusetts. Here's what changes if you rent or own a condo unit:
If you rent: The structural rebates (heat pump, insulation, windows, solar) go to whoever owns the property, not you. A free smart thermostat installed during a home energy assessment is often still available to renters — ask when you book. For the bigger upgrades, point your landlord to this page.
If you own a condo unit: In-unit upgrades you control yourself, like a heat pump water heater or an in-suite heat pump, may still qualify for the rebates above, usually with your building's approval for anything touching shared systems or exterior walls.
If it's a whole-building retrofit: Heat pumps, insulation, and solar for an entire condo or multi-family building go through a separate Mass Save multi-unit program rather than the single-family numbers above. Your condo board or property manager applies, not individual owners.
Rebate finder: every Mass Save program in Somerville, by category.
These are the real, current Mass Save amounts shown on our Somerville category pages — the same statewide program, not a Somerville-only deal. The whole-home heat pump ceiling is $8,500 in 2026, down from $10,000 in 2024, and regulators trimmed the 2025–2027 Mass Save budget by $500 million, and Mass Save has documented processing delays, so treat these as caps to plan around, not guaranteed instant payouts. Filter by category below.
Heat pump
Mass Save heat pump rebate
Up to $8,500
$2,650 per ton, capped at $8,500 for most households (down from $10,000 in 2024; regulators also trimmed the 2025–2027 Mass Save budget by $500 million). Income-qualified households can reach $16,000 for air-source or $25,000 for ground-source. Only R-32 or R-454B refrigerant systems qualify as of January 1, 2026 — older R-410A units are no longer eligible. Same statewide, not just Somerville.
Source: /us/ma/somerville/heat-pump · Mass Save
Solar
SMART 3.0 solar incentive
Per-kWh incentive
Not a flat rebate — SMART 3.0 locks in a per-kWh production payment for a fixed term once you're enrolled, on top of your own electricity savings. Same program statewide.
Source: /us/ma/somerville/solar · Mass Save
Battery
Battery storage rebate
ConnectedSolutions pay-for-performance
There's no upfront Mass Save battery rebate. You earn ConnectedSolutions payments (MassCEC example: about $1,375/yr for a 5 kW battery), plus the SMART storage adder if paired with solar.
Source: /us/ma/somerville/battery · Mass Save
Insulation
Insulation & air sealing
75–100% off
Mass Save covers 75% of the cost for every Massachusetts homeowner, including Somerville. If your household is under 60% of area median income, it's covered at 100% — free.
Source: /us/ma/somerville/insulation · Mass Save
Water heater
Heat-pump water heater rebate
$750
A flat $750 for a heat pump water heater. The unit needs to be ENERGY STAR certified to qualify. Same flat amount statewide.
Source: /us/ma/somerville/water-heater · Mass Save
Windows & doors
ENERGY STAR windows & doors
$75/window
Mass Save pays $75 per window when you replace single-pane windows with ENERGY STAR Most Efficient certified windows.
Source: /us/ma/somerville/windows-doors · Mass Save
EV charger
Home EV charger rebate
Varies
Eversource and National Grid each run their own home EV charger programs; amounts and income rules differ, so check your utility.
Source: /us/ma/somerville/ev-charger · Mass Save
Smart thermostat
Smart thermostat rebate
$100
Often installed for free during your Mass Save home energy assessment — the $100 rebate covers the rest if you buy your own.
Source: /us/ma/somerville/smart-thermostats · Mass Save
Amounts are Mass Save program-wide figures and apply the same whether you're an Eversource or National Grid customer — we checked a sample of Somerville and other Massachusetts city pages and found no utility-level variance in these headline caps. Processing can take 5–7 months end to end; see your Somerville heat pump page for the full application timeline.
Heat pump installers in Somerville
Real companies serving Somerville, pulled from their current Google reviews. We're not paid to list anyone here.
Once a month: new and changing rebate programs across every province and state we cover, plus what's new in heat pumps, solar and batteries. Short, sourced, no marketing.
