What Is the Mass Save HEAT Loan?
The Mass Save HEAT Loan (Home Energy Assessment to Loan) is a 0% interest financing program available to Massachusetts homeowners who complete a free Home Energy Assessment and invest in approved energy efficiency improvements. Administered through a network of participating lenders, the HEAT Loan provides up to $50,000 at zero percent interest with repayment terms of up to 7 years for insulation and air sealing projects, or up to 10 years when combined with heating system replacements.
The “HEAT” in HEAT Loan stands for Home Energy Assessment to Loan, which reflects the program's central requirement: you must complete a Mass Save Home Energy Assessment before you can apply. The assessment is completely free, takes 2–4 hours, and provides a detailed evaluation of your home's insulation levels, air leakage, heating system efficiency, and overall energy performance. The auditor uses professional-grade tools including a blower door to measure air leakage and an infrared camera to identify thermal bridging and insulation gaps.
What makes the HEAT Loan exceptional compared to other home improvement financing is the combination of zero interest, no origination fees, no prepayment penalties, and a maximum loan amount of $50,000. For context, a typical Massachusetts homeowner financing $4,000 of insulation work through an 8% personal loan would pay approximately $1,400 in interest over 5 years. That same $4,000 through the HEAT Loan costs exactly $4,000 with zero interest charges over 7 years, saving the homeowner $1,400 in pure interest costs while also stretching payments over a longer term for lower monthly payments.
The HEAT Loan is funded through the Mass Save program, which collects revenue from a system benefit charge on every Massachusetts gas and electric utility bill. This means that as a Massachusetts ratepayer, you have already been contributing to the program that subsidizes the 0% interest rate. Taking advantage of the HEAT Loan is simply recovering value from a program you have been funding with every utility payment.
HEAT Loan at a Glance
HEAT Loan Eligibility Requirements
The HEAT Loan is available to the vast majority of Massachusetts homeowners, but there are specific eligibility criteria you need to meet. Understanding these requirements upfront helps you plan your timeline and avoid delays when coordinating with a roof replacement project.
Participating Utility Requirement
You must be a customer of a utility that participates in the Mass Save program. The participating utilities serve approximately 90% of Massachusetts households. If you receive your electric or gas bill from any of the following providers, you qualify on the utility front:
Electric Utilities
- • Eversource — Eastern and western Massachusetts
- • National Grid — Central and southeastern Massachusetts
- • Unitil — Fitchburg and surrounding communities
- • Cape Light Compact — Cape Cod and Martha's Vineyard
Gas Utilities
- • Eversource Gas — Eastern and central Massachusetts
- • National Grid Gas — Central and southeastern Massachusetts
- • Unitil Gas — North-central Massachusetts
- • Berkshire Gas — Western Massachusetts
- • Liberty Utilities — Southeastern Massachusetts
Municipal Electric Customers: If your electric bill comes from a municipal utility (Braintree Electric, Chicopee Electric, Holyoke Gas & Electric, etc.), you are not eligible for the Mass Save HEAT Loan. However, many municipal utilities offer their own energy efficiency loan programs. Contact your municipal utility directly.
Home Energy Assessment Requirement
Every HEAT Loan applicant must complete a Mass Save Home Energy Assessment (HEA) before applying. This is a non-negotiable prerequisite. The assessment is completely free and serves two purposes: it identifies which energy efficiency improvements your home needs, and it generates the formal recommendations that authorize you to apply for the HEAT Loan. Without a completed HEA on file, no participating lender will process your application.
The assessment takes approximately 2–4 hours and covers your entire home, including attic insulation depth and condition, wall insulation presence and R-value, basement and crawlspace insulation, air leakage measured by blower door test, heating and cooling system efficiency, hot water system, lighting, and appliances. You will receive a prioritized list of recommended improvements along with estimated costs and rebate amounts.
Credit and Lender Requirements
The HEAT Loan requires a basic credit check through a participating lender. The minimum credit score requirement varies by lender but is typically around 580, which is significantly lower than the 680+ required for most home improvement loans. The loan does not place a lien on your property, which is a major advantage over HELOCs and home equity loans. You do not need to own your home free and clear; homeowners with existing mortgages qualify. The debt-to-income ratio requirements are also more flexible than conventional lending because the 0% interest rate means lower monthly payments relative to the loan amount.
Step-by-Step: Getting a HEAT Loan for Your Roof + Insulation Project
Combining a HEAT Loan with a roof replacement requires careful timing and coordination. Follow this process to ensure everything aligns properly and you maximize your savings on both the insulation rebate and the 0% financing.
Schedule Your Free Home Energy Assessment (8–10 Weeks Before Reroof)
Call Mass Save at 1-866-527-7283 or visit masssave.com to schedule your free Home Energy Assessment. Tell the scheduler you are planning a roof replacement and want to coordinate insulation work. Assessment wait times vary by season: spring and early summer typically have 1–2 week waits, while fall demand can push scheduling out 2–3 weeks. The assessment itself takes 2–4 hours and requires you to be home. The auditor will inspect your attic, measure existing insulation depth, perform a blower door test, scan with an infrared camera, and evaluate your heating system. This is the critical first step that unlocks both the 75% insulation rebate and the HEAT Loan eligibility.
Complete Recommended Air Sealing and Insulation Work (4–6 Weeks Before)
After the assessment, you will receive a report (typically within 1–2 weeks) with specific recommendations and a list of Mass Save-approved insulation contractors. The most common recommendation for homeowners planning a reroof is attic insulation to R-49 plus comprehensive air sealing. Mass Save covers 75% of the approved insulation cost for standard-income households and 100% for income-eligible households. The insulation work must be completed by a Mass Save-approved contractor to qualify for both the rebate and the HEAT Loan. Schedule the insulation contractor to work during or immediately after your roof replacement for maximum efficiency.
Apply for the HEAT Loan Through a Participating Lender (2–4 Weeks Before)
With your assessment complete and insulation recommendations in hand, apply for the HEAT Loan through one of the participating lenders listed on masssave.com. You will need your assessment reference number, a copy of the insulation contractor's quote (showing the work to be performed and total cost after rebate), and standard identification and income documentation. Most lenders process HEAT Loan applications within 3–5 business days. The approval letter specifies the maximum loan amount and confirms the 0% interest rate and 7-year term. You can apply to multiple lenders simultaneously to compare terms and credit requirements.
Combine with Your Roof Replacement Project (Project Week)
Coordinate your roofing contractor and insulation contractor to work in sequence. The ideal approach is to have the roofer complete the tear-off, install new ice and water shield and underlayment, install ventilation baffles at the eaves, and complete the new roofing material. Then, 1–2 days later, the Mass Save-approved insulation contractor arrives to blow in new attic insulation to R-49 or R-60 and perform comprehensive air sealing. This sequencing ensures the insulation is installed under a new, watertight roof and the roofer has already installed proper ventilation baffles to prevent insulation from blocking soffit vents. For more on coordinating this process, see our Mass Save roofing and insulation rebates guide.
Timeline Summary
Weeks 1–3: Schedule and complete Home Energy Assessment
Weeks 2–4: Receive assessment report and insulation recommendations
Weeks 3–5: Apply for HEAT Loan, receive approval (1–2 weeks)
Weeks 4–6: Schedule insulation contractor to align with roof replacement
Weeks 6–10: Roof replacement completed, insulation installed 1–2 days later
Week 10+: HEAT Loan disbursement after work verification
How to Combine the HEAT Loan with a Roof Replacement
The strategic advantage of combining a HEAT Loan with a roof replacement goes beyond just financing. When you do both projects together, you save on labor costs, eliminate the need for double scaffold setup, and ensure the insulation is installed under a brand-new, leak-free roof. This coordination turns what many homeowners treat as two separate projects into a single, more cost-effective undertaking.
The key to successful coordination is understanding what the HEAT Loan covers versus what it does not. The HEAT Loan covers all energy efficiency improvements recommended through your Home Energy Assessment: attic insulation (blown-in cellulose or fiberglass to R-49 or R-60), wall insulation (dense-pack cellulose), basement and crawlspace insulation, comprehensive air sealing, duct sealing and insulation, and even heating system upgrades if recommended. It does not cover roofing materials (shingles, metal panels, underlayment, flashing, drip edge), roofing labor, or structural roof repairs.
The Dual-Financing Strategy
Smart Massachusetts homeowners use a dual-financing approach: the HEAT Loan at 0% for the insulation and energy efficiency portion, and a separate financing vehicle for the roofing materials and labor. This approach minimizes your total interest expense because the insulation cost (which would otherwise carry interest charges) is financed at 0%, while only the roofing portion carries any interest cost. For roofing-specific financing options, see our Massachusetts roof replacement financing guide.
Dual-Financing Example: Typical MA Home
| Component | Cost | Financing | Interest Paid |
|---|---|---|---|
| Roof replacement (shingles + labor) | $14,000 | HELOC at 7.5% | $2,800 over 5 yrs |
| Attic insulation (R-49) | $4,000 | 75% Mass Save rebate | $0 (rebate) |
| Insulation remainder after rebate | $1,000 | HEAT Loan at 0% | $0 |
| Air sealing | $1,200 | 75% rebate + HEAT Loan | $0 |
| Total Project | $20,200 | Out of pocket: $15,300 | $2,800 interest |
Without the Mass Save rebate and HEAT Loan, this same homeowner would pay $20,200 out of pocket plus $4,200 in interest if everything were financed at 7.5%. The HEAT Loan strategy saves $4,900 in rebates plus $1,400 in avoided interest, for a total benefit of $6,300 before factoring in the annual heating cost reductions.
What Qualifies for the HEAT Loan (and What Does Not)
One of the most common questions from homeowners planning a combined roof and insulation project is exactly which costs the HEAT Loan can cover. The distinction is straightforward: if it improves your home's energy efficiency and was recommended through your Home Energy Assessment, it likely qualifies. If it is a structural or cosmetic improvement, it does not.
Qualifies for HEAT Loan
- ✓ Attic insulation (blown-in cellulose or fiberglass to R-49 or R-60)
- ✓ Wall insulation (dense-pack cellulose)
- ✓ Basement and crawlspace insulation
- ✓ Comprehensive air sealing (attic floor, rim joists, penetrations)
- ✓ Duct sealing and duct insulation
- ✓ Heating system replacement (furnace, boiler, heat pump)
- ✓ Central air conditioning and mini-split installation
- ✓ Water heater replacement (heat pump or high-efficiency)
- ✓ Energy-efficient windows and doors
- ✓ Thermostatic radiator valves and smart thermostats
Does NOT Qualify for HEAT Loan
- ✗ Roofing materials (asphalt shingles, metal panels, slate, tile)
- ✗ Roofing labor and installation
- ✗ Underlayment, ice and water shield, drip edge
- ✗ Flashing and chimney work
- ✗ Gutters and downspouts
- ✗ Roof decking/sheathing replacement
- ✗ Structural roof repairs (rafters, trusses)
- ✗ Skylights (unless part of a qualifying improvement)
- ✗ Solar panels or solar shingles
- ✗ Cosmetic renovations and siding
The practical implication is clear: if you are doing a $14,000 roof replacement with $4,500 in insulation and air sealing work, the $4,500 in insulation work gets the 75% Mass Save rebate (reducing your cost to ~$1,125), and that remaining $1,125 can be financed at 0% through the HEAT Loan. The $14,000 in roofing costs needs its own financing vehicle. This separation is what makes the dual-financing strategy so powerful. For a comprehensive comparison of roofing financing options, see our Massachusetts roof financing guide.
Cost Savings Breakdown: HEAT Loan vs. Personal Loan
The financial advantage of the HEAT Loan becomes most apparent when you compare it directly to the alternatives. Most homeowners who finance insulation without the HEAT Loan use either a personal loan (typically 8–12% APR), a home equity line of credit (7–9% APR), or a credit card (18–25% APR). The interest savings from the HEAT Loan compound over the 7-year term and can be substantial even on relatively modest insulation projects.
Interest Savings: $4,000 Insulation Project Over 7 Years
| Financing Method | APR | Monthly Payment | Total Interest Paid | Total Cost |
|---|---|---|---|---|
| HEAT Loan | 0% | $47.62 | $0 | $4,000 |
| Personal loan | 8% | $62.38 | $1,240 | $5,240 |
| HELOC | 7.5% | $61.22 | $1,143 | $5,143 |
| Home improvement loan | 10% | $66.53 | $1,588 | $5,588 |
| Credit card | 22% | $86.19 | $3,240 | $7,240 |
For a typical insulation project costing $3,500–$5,000 before the Mass Save rebate, the out-of-pocket amount after the 75% rebate is $875–$1,250. Financing this remainder through the HEAT Loan saves $200–$500 in interest compared to a personal loan. While these numbers may seem modest on the insulation portion alone, the real savings add up when you consider the full picture:
Total 10-Year Financial Impact for Typical MA Homeowner
The heating cost reduction alone typically delivers $300–$800 per year for a Massachusetts home upgrading from R-19 to R-49 attic insulation. Over the 7-year HEAT Loan term, that is $2,100–$5,600 in cumulative heating savings, which more than offsets the entire out-of-pocket insulation cost. When you factor in the rebate, the 0% interest, and the heating savings, the insulation upgrade is cash-flow positive from the first month. Your monthly HEAT Loan payment on $1,000 over 7 years is approximately $12, while your monthly heating savings average $25–$67. You are literally being paid to improve your home.
Energy Savings from Insulation Upgrades During a Reroof
The energy savings from upgrading attic insulation to R-49 during a roof replacement are well documented across thousands of Massachusetts homes that have completed the Mass Save program. The Department of Energy estimates that proper attic insulation reduces heating and cooling costs by 10–50%, with most Massachusetts homes seeing a 15–30% reduction in annual heating expenses after upgrading from R-19 or R-30 to R-49.
For a Massachusetts home spending $3,000–$4,000 per year on heating (the state average for a gas-heated, 1,800-square-foot home), a 15–30% reduction translates to annual savings of $450–$1,200. The more conservative $300–$800 range accounts for homes that already have partial insulation and homes that have already completed some air sealing. Regardless of where your home falls in that range, the savings are permanent, inflation-protected (they grow as energy costs rise), and begin immediately upon project completion.
The energy savings compound with the ice dam prevention benefit. Massachusetts homeowners spend an average of $500–$2,000 per ice dam event on emergency repairs, interior damage restoration, and preventive measures like heat cables. Proper attic insulation eliminates the root cause of ice dams by keeping heat inside the living space rather than escaping through the attic to melt snow on the roof. A single avoided ice dam event can pay for the entire out-of-pocket insulation cost after the Mass Save rebate. For a deeper discussion on how insulation and ventilation interact to prevent ice dams and attic mold, see our attic ventilation and mold prevention guide.
Annual Energy Savings by Insulation Upgrade Level
Homeowners in municipalities that have adopted the Massachusetts Stretch Energy Code may want to consider upgrading beyond R-49 to R-60, which exceeds current code requirements and maximizes energy savings. For more on how the Stretch Code affects your roofing project costs and requirements, see our Massachusetts Stretch Code roofing cost impact guide.
Participating HEAT Loan Lenders
The Mass Save HEAT Loan is not offered directly by Mass Save or by the utilities. Instead, it is administered through a network of participating banks and credit unions across Massachusetts that have agreed to offer the 0% interest rate, with the interest subsidy funded by the Mass Save program. Each participating lender handles its own application processing, credit underwriting, and loan servicing.
The full list of participating lenders is maintained on the Mass Save website at masssave.com/saving/residential-rebates/heat-loan-program. The list changes periodically as lenders join or leave the program. As of 2026, the network includes major regional banks and credit unions across Massachusetts. You can also call Mass Save at 1-866-527-7283 and ask to be connected with a participating lender in your area.
Tips for Choosing a HEAT Loan Lender
Compare credit requirements
While the 0% interest rate is standard across all participating lenders, credit score minimums and debt-to-income requirements can vary. If you have marginal credit, apply to multiple lenders to increase your approval chances.
Ask about processing time
Some lenders process HEAT Loan applications in 3 business days; others take 7–10 days. If you are on a tight timeline with your roof replacement, choose a lender known for fast processing.
Verify maximum loan amounts
While the program maximum is $50,000, some lenders may cap their HEAT Loans at lower amounts based on their own risk policies. Confirm the maximum before applying if you have a large project.
Check for existing customer benefits
If you already bank with a participating lender, your application may be expedited and you may receive more favorable credit terms based on your existing relationship and account history.
Stacking the HEAT Loan with Other Incentives
One of the most powerful aspects of the HEAT Loan is that it can be combined with other federal and state incentives to further reduce your out-of-pocket costs. Massachusetts homeowners doing a combined roof and insulation project in 2026 can potentially stack multiple programs for significant total savings.
Mass Save 75% Insulation Rebate + HEAT Loan
This is the standard combination. Mass Save covers 75% of your insulation cost as a direct rebate, and the HEAT Loan finances the remaining 25% at 0% interest. For a $4,000 insulation project, you receive a $3,000 rebate and finance $1,000 at 0%. Your monthly payment is approximately $12 for 7 years.
Federal Energy Efficiency Tax Credit (25C)
The federal 25C tax credit provides a 30% credit (up to $1,200 per year) for qualifying insulation improvements. This credit applies to the insulation material cost after the Mass Save rebate. If your post-rebate insulation cost is $1,000, you may claim a $300 federal tax credit, effectively reducing your true cost to $700. The HEAT Loan then finances the $1,000 at 0% while you recoup $300 on your tax return. For more on energy efficiency tax credits for roofing projects, see our 2026 energy efficient roofing tax credits guide.
Mass Save Heating System Rebates + HEAT Loan
If your Home Energy Assessment recommends a heating system upgrade alongside insulation, you can bundle both into a single HEAT Loan up to $50,000. Mass Save offers substantial rebates on heat pumps ($10,000+), high-efficiency furnaces, and boilers. The HEAT Loan covers the post-rebate balance at 0% for up to 10 years when a heating system is included. This is relevant for homeowners who are planning a comprehensive energy upgrade alongside their reroof.
Income-Eligible Enhanced Benefits
Households at or below 60% of the state median income receive 100% insulation coverage (zero cost), which may eliminate the need for a HEAT Loan on insulation entirely. However, income-eligible households can still use the HEAT Loan for other energy efficiency improvements like heating system upgrades, making it a valuable tool even when insulation is fully covered. For details on income eligibility, see our Mass Save roofing insulation rebates guide.
Common Mistakes When Combining HEAT Loan with Roof Replacement
After reviewing thousands of Massachusetts roofing and insulation projects, certain mistakes come up repeatedly. Avoiding these pitfalls can save you weeks of delays and thousands of dollars in lost savings.
Mistake #1: Getting the roof done first without scheduling the HEA
The most expensive mistake is completing your roof replacement without first scheduling the Home Energy Assessment. Once the roof is done and the attic is inaccessible (or the work timing no longer aligns), you lose the cost efficiency of coordinated installation. You can still get Mass Save insulation later, but you will pay more for the labor since the attic access is less convenient and you cannot coordinate with the roofing crew. Always schedule the HEA at least 8 weeks before your planned reroof date.
Mistake #2: Using a non-approved insulation contractor
The HEAT Loan requires that all insulation work be performed by a Mass Save-approved contractor. Some homeowners try to save money by using their roofing contractor or a non-approved insulation company for the insulation work. This disqualifies you from both the 75% rebate and the HEAT Loan. Always use the approved contractor list provided after your Home Energy Assessment.
Mistake #3: Not installing ventilation baffles before insulation
When blown-in insulation is installed without proper ventilation baffles at the eaves, it blocks soffit vents and destroys the attic ventilation system. This causes moisture problems, mold growth, and shortened roof life. Your roofing contractor should install baffles (AccuVent, Durovent, or equivalent) at every soffit bay during the reroof, before the insulation crew arrives. This is critical for the long-term performance of both the insulation and the new roof.
Mistake #4: Applying for the HEAT Loan before the assessment is complete
No participating lender will process a HEAT Loan application without a completed Home Energy Assessment on file with Mass Save. Some homeowners apply prematurely and waste time. Complete the assessment, receive your recommendations, get the insulation contractor's quote, and then apply for the HEAT Loan with all documentation ready.
Mistake #5: Forgetting to coordinate insulation and roofing schedules
The insulation contractor and roofing contractor need to work in sequence, typically with the insulation crew arriving 1–2 days after the reroof is complete. If you schedule them independently without coordination, you may end up with a gap of weeks between the two projects, or worse, the insulation crew may arrive while the roofer is still working. Share both contractors' contact information and have them coordinate directly.
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Related Massachusetts Roofing & Financing Resources
Mass Save Roofing & Insulation Rebates
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MA Stretch Code Roofing Cost Impact
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Attic Ventilation & Mold Prevention MA
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Energy Efficient Roofing Tax Credits 2026
Federal 25C and 25D tax credits you can stack with the HEAT Loan for additional savings.