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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteZero-interest financing with terms up to 7 years (84 months), subject to program eligibility and lender approval. Covers heat pumps, insulation, weatherization, ENERGY STAR windows, and ConnectedSolutions batteries.
Sources reviewed October 17, 2026 | Federal 25C tax credit EXPIRED Dec 31, 2025
The Mass Save HEAT Loan is a 0% interest financing program available to Massachusetts homeowners through Mass Save utility partners (Eversource, National Grid, Unitil, Cape Light Compact, Berkshire Gas, Liberty Utilities). It provides up to $25,000 at 0% APR for qualifying energy improvements including heat pump installations, heat pump water heaters, insulation, weatherization, pre-weatherization barriers, ENERGY STAR replacement windows, and residential batteries enrolled in ConnectedSolutions. Terms are up to 7 years (84 months). The $25,000 cap is a lifetime combined limit, not a new allowance per project. Program authorization is not bank approval: a participating lender separately reviews your credit and sets the loan conditions. A no-cost Home Energy Assessment is required for certain measures, not every application. The federal 25C tax credit expired December 31, 2025.
Everything you need to know about the HEAT Loan in six facts.
Interest Rate
0%
Interest is subsidized; lender approval is still required
Maximum Amount
$25,000
Lifetime combined cap across eligible upgrades
Shorter-Term Example
3 years
Greenfield Co-op publishes this term above 300% SMI; confirm your lender terms
Maximum Term
7 years
Greenfield Co-op publishes this term at 80–135% SMI; not guaranteed for every borrower
Fee Example
$0
MIT FCU advertises no processing or service fees; other charges depend on the lender
Early-Payoff Example
None
MIT FCU advertises no prepayment penalty; check your loan agreement
Per Mass Save's published program terms:
Specific terms, credit requirements and monthly payments are confirmed by your lender. No-processing-fee and no-prepayment-penalty offers exist, but late fees or secured-loan costs can apply. Compare the disclosures, not just the interest rate.
Sources reviewed October 17, 2026: Mass Save eligibility and application steps, Mass Save lender FAQs, participating lender directory.
Lender examples, not endorsements: MIT FCU fee and early-payoff terms; Greenfield Co-op income-based terms and mortgage requirements; Eastern Bank credit approval and late-fee disclosure.
Sample payments at the maximum 7-year (84-month) term. Shorter terms produce higher monthly payments for the same total. Because there is no interest, principal repayments equal the amount borrowed. Examples are rounded; confirm lender charges and the exact final payment separately. Greenfield Co-op's published example uses 7 years at 80–135% State Median Income (SMI), 5 years at 135–300% SMI and 3 years above 300% SMI. Confirm the current rules for your application; do not assume every borrower gets 84 months.
| Term | $10,000 Loan | $15,000 Loan | $25,000 Loan |
|---|---|---|---|
| 7 years (84 mo) | $119/mo | $179/mo | $298/mo |
| 5 years (60 mo) | $167/mo | $250/mo | $417/mo |
| 3 years (36 mo) | $278/mo | $417/mo | $694/mo |
At 0% interest, your principal does not grow. A $15,000 HEAT Loan repays $15,000 of principal regardless of your term length — only the monthly payment changes. No interest is charged; these examples exclude any applicable lender charges and do not guarantee loan approval.
Seven steps, with two separate decisions: program authorization and lender credit approval. Get approval before starting work.
Check your residential utility account, homeowner status and remaining lifetime HEAT Loan allowance with Mass Save.
A no-cost Home Energy Assessment is required for whole-home heat pumps, partial-home heat pumps seeking bonus incentives, windows, weatherization and pre-weatherization barriers. It is recommended, not required, for other financeable measures.
Choose a participating contractor and obtain a signed proposal on company letterhead. Confirm the exact equipment and scope meet current program requirements.
Send the proposal and required documents through the program application. The resulting Authorization Form confirms eligible work and the authorized amount; it is not bank approval.
Give the Authorization Form to your chosen lender for a separate credit review. Ask about documents, membership, fees, collateral, repayment term and decision timing. Obtain lender approval before starting work.
After lender approval, arrange installation and payment using the lender-issued two-party check. Submit applicable rebate documents; confirm the net financeable amount and payment timing before committing to the project.
Complete the required verification inspection; call 866-527-7283 for instructions. Follow your lender agreement for monthly payments and any final documentation.
The HEAT Loan finances qualifying improvements, not every home project. Confirm the proposed scope, required assessment, participating contractor and equipment eligibility before applying. The official categories include:
What about doors, duct sealing, duct insulation or smart thermostats bundled into a larger project? Ask Mass Save to confirm each proposed line item in the authorized scope; being included in a contractor quote does not by itself make an improvement financeable.
Illustrative $15,000 borrowing scenarios, not current lender quotes. The comparison assumes fixed rates, level monthly payments and upfront fees paid separately; a disclosed APR can differ when fees apply. Actual offers, variable-rate HELOCs and eligibility differ; solar PV itself is not an eligible HEAT Loan measure.
| Feature | HEAT Loan | Solar Loan | Personal Loan | HELOC |
|---|---|---|---|---|
| Interest rate (fees separate) | 0% | 7.5% | 9% | 8.5% |
| Fees / Points | $0 assumed upfront fees | ~$330 (2.2%) | $0 | ~$300 (2%) |
| Term | Up to 7 years | 20 years | 7 years | 10 years |
| Total Cost on $15K | $15,000 | $29,331 | $20,272 | $22,617 |
| Extra Cost vs HEAT Loan | $0 | +$14,331 | +$5,272 | +$7,617 |
Your contractor can help with the eligible project proposal, but the lender makes its own credit decision. Ask whether you can apply online and which income documents, signatures or branch visits it requires.
The federal Section 25C energy efficiency tax credit expired December 31, 2025. There is no federal tax credit for heat pumps, insulation, or weatherization in 2026. The HEAT Loan at 0% interest combined with Mass Save rebates is now your primary cost-reduction pathway.
The Mass Save HEAT Loan offers 0% interest financing up to $25,000 for qualifying home energy upgrades. Mass Save reviews project eligibility; a participating bank or credit union separately decides whether to lend. Terms can be up to 7 years (84 months). Compare lender disclosures for origination and closing costs, late fees, collateral and early-payoff terms rather than assuming every loan has identical conditions.
Massachusetts homeowners with a qualifying residential account at Berkshire Gas, Cape Light Compact, Eversource, Liberty Utilities, National Grid or Unitil may apply. Municipal-electric customers may qualify if their home is heated with natural gas provided by a Mass Save Sponsor, subject to program requirements and lender approval. Meet the project requirements and complete a Home Energy Assessment when required for your measure. There is no minimum credit score requirement published by Mass Save for all lenders, but each participating lender applies its own credit and income underwriting. Ask your chosen lender about its minimum score, income documents and membership requirements. Program authorization does not guarantee credit approval.
There is no single approval timeline promised on the current Mass Save financing page. First obtain the program Authorization Form, then complete a separate lender credit review. Timing depends on complete documents and the selected lender. Ask both the program administrator and your lender for current turnaround estimates, and obtain lender approval before starting work. Repayment terms can be up to 7 years (84 months); the lender confirms your actual term and payment.
Yes. Available Mass Save incentives reduce the project cost eligible for financing. As an illustrative example, a $16,000 eligible project minus $9,500 in confirmed incentives leaves $6,500 to finance at 0%, subject to authorization and lender approval. This is not a promised rebate or installation price. Confirm your actual incentive, eligible scope and payment timing; an eventual rebate is not necessarily available to pay an upfront deposit. Terms may be up to 7 years.
Early payoff is possible; for example, MIT Federal Credit Union advertises no prepayment penalty on its HEAT Loan. Ask your own lender for a payoff statement and confirm any applicable charges. Paying a 0% loan early does not save interest, but your cash-flow needs may differ. Refinancing is a separate credit transaction, not an automatic HEAT Loan benefit, and could replace the 0% rate with interest or fees.
HEAT Loans can be secured or unsecured, so the answer depends on your lender agreement. Some lenders require a mortgage or other collateral for certain loan amounts; others offer unsecured loans. Before selling, ask the lender and your closing attorney whether a payoff or lien release is required, obtain the payoff amount and confirm how it will be handled. Do not assume the loan transfers to the buyer or that a higher sale price will offset the balance.
Effective January 1, 2025, Mass Save lists a $25,000 lifetime combined maximum across eligible energy-efficiency upgrades, not a fresh $25,000 allowance for each project. Prior HEAT Loan borrowing counts toward that limit; confirm your remaining eligibility with the program. Financing is at 0% interest with terms up to 7 years (84 months), subject to program authorization and participating lender approval.
No. The federal Section 25C energy efficiency tax credit expired on December 31, 2025. There is no federal tax credit for heat pumps, insulation, or weatherization in 2026. The HEAT Loan at 0% interest combined with Mass Save rebates is now your primary cost-reduction pathway in Massachusetts.
NuWatt is a Mass Save participating contractor. We help with your project proposal, equipment eligibility and rebate paperwork. Your selected lender handles credit approval. Start with a free assessment.
Mass Save HEAT Loan: 0% interest, up to $25,000, subject to approval and lender terms. Call 866-527-7283 to schedule your Home Energy Assessment.