Mass Save® Rebates for Small Business: What the Program Pays for a Heat Pump, and Who Files the Paperwork

Looking for a home project? Our separate 2026 Mass Save® heat pump rebate guide for homeowners compares residential whole-home, partial-home, basic, and income-qualified routes.

Am I a small business under Mass Save®?

The program does not decide this by headcount or revenue. It decides it by energy use. National Grid, one of the six Mass Save® Sponsors, defines a small business on its Massachusetts small business page as one that has “an average annual usage of 1.5M kWh or less, or 40k therms or less” (read 1 September 2026). Meeting either threshold is enough — it is “or”, not “and”.

If you do not know your annual usage, your electric bill prints the month’s kWh and your gas bill prints the month’s therms. Twelve months added together is the number to compare.

Two different things get called “the small business program”, and mixing them up is where the percentages come from. The first is the small business assessment track: the Sponsor assesses the building, then pays a share of the installed cost of the measures it recommends — National Grid’s page puts that share at “up to 70% of the installation costs” for LED lighting upgrades. The second is the heat pump rebate, which is what this page is about.

Is there a grant to help pay for air conditioning for my shop?

Not a grant. What exists is a rebate: a fixed amount per ton, paid by the Mass Save® Sponsors after a qualifying heat pump is installed and the application is approved. Mass Save® is the collaborative of Berkshire Gas, Cape Light Compact, Eversource, Liberty, National Grid and Unitil (masssave.com/about-us, read 1 September 2026). No municipal light plant is a Sponsor, which matters in the town section below.

The words “air conditioning” matter here. A heat pump cools exactly the way an air conditioner does — same refrigeration cycle, sized to the same cooling load — and it also heats. The rebate attaches to the heating side: the 2026 form is for heat pumps that displace an existing heating system, and it requires that the fossil-fuel equipment being displaced is removed, disconnected from the panel or thermostat, or has its fuel line disconnected and capped. So the practical answer for a shop with no air conditioning is that the way to get help paying for cooling is to install a heat pump that replaces or supplements what heats the space today.

Which models are on the list, and why an ENERGY STAR label is not enough on its own, is covered in our article on which mini splits actually qualify for a Mass Save® rebate. We confirm the specific model on your quote against the current list, in writing, before anything is ordered.

What does Mass Save® pay per ton in 2026?

The three commercial rates below are printed on the 2026 Commercial Heat Pump Rebate Application for existing buildings, the document the Sponsor pays against. They are the most-quoted numbers in this program and the most often misquoted, so the table carries its source and its date.

The tonnage line is the one nobody publishes, and it is what turns a quote into a rebate figure. A system rated at 36,000 Btu/h of cooling is 3 tons; at $2,000 per ton that is $6,000, provided it does not exceed the installed cost. Read the cooling capacity off the AHRI certificate for the exact model on your quote, not off the marketing name, and note that the rate depends on equipment type — a VRF system and a ground source system each carry a different figure. How we arrive at the tonnage for your building is in How We Size Your System further down.

What changed on 1 July 2026?

Since 1 July 2026, pre-approval is required for every commercial heat pump project (masssave.com business air source and VRF pages, read 1 September 2026). The sequence now runs in this order, and the order is the point:

1. Pre-approval application, before anything is ordered or installed. This is the Rebate Commitment Letter Application (document code 0083_HPLA_1.26), which carries the same electric Sponsor information block as the rebate form.
2. The Sponsor issues a Rebate Commitment Letter. On projects of 35 tons or less it is valid for four months from issue.
3. Installation, inside that window, with equipment that is on the Heat Pump Qualified Product List on the day it is filed.
4. The rebate application, after installation, with the installed-cost documentation. The rebate is then paid — never more than the installed cost.
5. Over 35 tons, the project leaves the prescriptive form and goes through a custom pathway with its own review.

Do I qualify in my town?

The town is the wrong unit. Eligibility is a property of two things: the fuel the building heats with today, and which company bills its electricity and gas. The 2026 form says this itself. Its electric block is headed “ELECTRIC SPONSOR INFORMATION (REQUIRED FOR ALL DISPLACEMENT TYPES UNLESS IN MUNICIPAL ELECTRIC TERRITORY)”, and the 2026 Rebate Commitment Letter Application repeats it as a form field.

Mass Save® is funded by its six Sponsors, and a municipal light plant is not one of them. So a business whose electricity comes from a light plant has no electric-account route — but a business in the same town heated by natural gas from a Sponsor still has a route through its gas account, and a business on oil, propane or electric resistance in that town may have the light plant’s own program instead. Which of the three applies to a given address is below.

If Eversource bills your building, our Eversource page covers that account specifically. If your town runs its own light plant — Belmont, Braintree, Concord, Hingham, Hull, Lakeville, Mansfield, Marblehead, Middleborough, North Attleborough, Norwood, Peabody, Raynham, Reading, Taunton, Wakefield or Wellesley — read the municipal light plant page instead: it works through the fuel condition town by town and lists what each light plant publishes for commercial customers. A page for National Grid customers is in progress; until it publishes, your town’s page under our service area states which route applies to its utilities, and we confirm the answer for your address in writing, at no cost, before you commit to anything. Sometimes that answer is that no Mass Save® route exists for the building, and we say so.

Who handles the paperwork?

We do, and it is four filings rather than one. First, the pre-approval application, before anything is ordered. Second, the Rebate Commitment Letter — we track its four-month window against the install date so it cannot lapse on the job. Third, the rebate application after installation, with the installed-cost documentation the form asks for. Fourth, the manufacturer warranty registration for the equipment, which is separate from Mass Save® entirely and is the step most often missed in this trade: the customer assumes the installer did it, the installer assumes the customer will, and neither does.

One distinction we keep deliberately sharp. We service what we install, under warranty, and we register that warranty for you. We do not service, diagnose or repair equipment installed by another company. If your existing system has failed and you are weighing a repair against a replacement, our repair-or-replace decision guide is written for exactly that question, and it has no repair revenue riding on the answer.

The Vietnamese-language line is 617-309-8804. The main line is (617) 802-4848.

Can I finance the rest?

Eligible Eversource businesses may have financing options through the National Energy Improvement Fund (NEIF). The project, utility account, incentive choice, and lender approval determine what is available.

Eligible National Grid businesses may be able to repay their share of an approved efficiency project through the electric bill. The utility confirms the account, project, payment schedule, and approval.

Financing is subject to the utility or lender’s current terms and approval. Incentive eligibility is determined separately, and a subsidized rate may affect the incentive amount. Compare the written equipment price, incentive, financed amount, rate, fees, and payment schedule before authorizing work.

Financing guidance reviewed September 10, 2026. Compare public program descriptions, contractor-reported terms, and current application routes on our commercial financing page.

Has this worked for a business like mine?

Two published jobs, both in Quincy: a nail salon that replaced a failing system before summer with the Mass Save® paperwork handled end to end, and a restaurant that solved a hot-and-cold-spot problem with zoned ductless units. Neither study quotes a rebate figure, and neither does this paragraph: rates reset each January, and a case-study number lifted out of context is exactly how stale figures travel. The rates that apply to your project are the 2026 rates in the table above.

Sources

• Mass Save®, 2026 Commercial Heat Pump Rebate Application, Existing Buildings (CI-HP-Exist-Bldgs.pdf), footer-stamped “Mass Save® 2026 | June 2026”. Per-ton rates, the installed-cost ceiling, the tonnage formula (footnote 8), the electric Sponsor block header and the displaced-equipment rule. Read 1 September 2026.
• Mass Save®, 2026 Rebate Commitment Letter Application (CI-HP-Commit-Letter-Application, document code 0083_HPLA_1.26). Repeats the municipal electric territory field. Read 1 September 2026.
• Mass Save® — Business Heat Pumps, with the business air source and VRF pages. Pre-approval required from 1 July 2026; Rebate Commitment Letter valid four months at 35 tons or less; custom pathway above 35 tons. Read 1 September 2026.
• Mass Save® — About Us. The six Sponsors. Read 1 September 2026.
• National Grid, Massachusetts Small Business energy saving programs. The 1.5M kWh / 40k therms definition and the “up to 70%” LED cost share. Read 1 September 2026.
• National Energy Improvement Fund — Mass Save® Commercial Financing. Current Eversource commercial financing context. Terms are confirmed directly with the lender and utility before work begins. Rechecked 10 September 2026.