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Get a Free QuoteThe best energy financing deal in Massachusetts. Zero interest, zero fees, terms up to 7 years (84 months). Covers heat pumps, insulation, weatherization, ENERGY STAR windows, and ConnectedSolutions batteries.
Last updated February 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). There are no origination fees, no closing costs, and no prepayment penalties. A free Home Energy Assessment is required before applying. The federal 25C tax credit expired December 31, 2025 — the HEAT Loan combined with Mass Save rebates is now your primary savings pathway.
Everything you need to know about the HEAT Loan in six facts.
Interest Rate
0%
Truly zero interest — no dealer fees, no hidden costs
Maximum Amount
$25,000
Can cover most residential heat pump installations
Shortest Term
3 years
For households above 300% SMI
Longest Term
7 years
For households below 135% SMI
Origination Fee
$0
No fees of any kind
Prepayment Penalty
None
Pay off early anytime with no penalty
Per Mass Save's published program terms:
Specific term lengths and monthly payment amounts are set by your participating lender during the application review.
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, you repay exactly what you borrow.
| 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 |
You repay exactly what you borrow. A $15,000 HEAT Loan costs $15,000 total regardless of your term length — only the monthly payment changes. No interest is ever charged.
Six steps from first call to approved financing. Most contractors handle the paperwork for you.
Call 866-527-7283 or schedule online at masssave.com. Assessment takes 2-4 hours.
Your assessment report includes a list of qualified contractors in your area.
Equipment must be on the Mass Save Qualified Product List (QPL). No R-410A systems.
Most contractors handle the loan paperwork. Approval typically takes 2-5 business days.
Contractor installs equipment, submits documentation to Mass Save for rebate processing.
0% interest for the full term. Payments auto-deducted monthly from your bank account.
The HEAT Loan finances a wide range of energy improvements. All items must be recommended during your Home Energy Assessment and installed by a Mass Save participating contractor.
How the HEAT Loan compares to common alternatives. On a $15,000 loan, the savings are dramatic.
| Feature | HEAT Loan | Solar Loan | Personal Loan | HELOC |
|---|---|---|---|---|
| APR | 0% | 7.5% | 9% | 8.5% |
| Fees / Points | $0 | ~$330 (2.2%) | $0 | ~$300 (2%) |
| Term | 3-7 years | 20 years | 7 years | 10 years |
| Total Cost on $15K | $15,000 | $31,200 | $20,100 | $21,800 |
| Extra Cost vs HEAT Loan | $0 | +$16,200 | +$5,100 | +$6,800 |
When you work with a Mass Save network contractor, the HEAT Loan application is built into the proposal process. No separate bank visit required.
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 HEAT Loan (Home Energy Assessment and Treatment Loan) is a 0% interest financing program offered through Mass Save. It provides up to $25,000 for qualifying energy improvements including heat pumps, insulation, air sealing, heat pump water heaters, and weatherization. There are no origination fees, no closing costs, and no prepayment penalties. The loan is serviced by Mass Save partner lenders such as Berkshire Bank and Cambridge Savings Bank.
Any Massachusetts homeowner who is a customer of a Mass Save participating utility (Eversource, National Grid, Unitil, or Cape Light Compact) is eligible. You must complete a free Home Energy Assessment first, and the improvements must be performed by a Mass Save participating contractor using equipment from the Qualified Product List. There is no minimum credit score requirement published by Mass Save, but the partner lender will conduct a standard credit review.
Most HEAT Loan applications are processed within 2-5 business days. Your contractor typically handles the paperwork. The HEAT Loan offers terms up to 7 years (84 months). Your participating lender will conduct a standard credit review and notify you of approval, your specific term, and your monthly payment amount.
Yes. The HEAT Loan is designed to cover your net cost after all rebates are applied. For example, if your heat pump costs $16,000 and you receive $9,500 in Mass Save rebates, you can finance the remaining $6,500 at 0% interest for up to 7 years.
Yes. There is no prepayment penalty on the HEAT Loan. You can pay it off at any time with no additional cost. Since the interest rate is 0%, there is no financial benefit to paying it off early (you are not saving on interest), but you have full flexibility to do so if your financial situation changes.
The HEAT Loan is a personal obligation, not a lien on your property. If you sell your home, you are responsible for paying off the remaining balance at closing. The loan balance will typically be deducted from your proceeds. Since the improvements add value to the home, the net effect on your sale proceeds is generally neutral or positive.
Effective January 1, 2025, the maximum financeable amount for the Mass Save HEAT Loan is $25,000 across all eligible measures combined. The loan is offered at 0% interest with terms up to 7 years (84 months), no origination fees, no closing costs, and no prepayment penalty.
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 handle the HEAT Loan paperwork, coordinate your rebates, and ensure your equipment is on the Qualified Product List. Start with a free assessment.
Mass Save HEAT Loan: 0% interest, $0 fees, up to $25,000. Call 866-527-7283 to schedule your Home Energy Assessment.