What Is Mass Save and How Does It Connect to Roofing?
Mass Save is a collaborative program funded by Massachusetts gas and electric utilities to promote energy efficiency across the state. Every Massachusetts ratepayer contributes to the program through a small system benefit charge on their utility bill, which entitles them to a free Home Energy Assessment and significant rebates on insulation, air sealing, heating equipment, and other energy efficiency improvements.
The connection to roofing is direct and significant: the single largest energy-efficiency improvement in most Massachusetts homes is upgrading attic insulation and air sealing. Attic insulation is most efficiently and cost-effectively upgraded during or immediately after a roof replacement, when the attic is accessible and the roofing contractor can coordinate with the insulation crew. By scheduling a Mass Save assessment before your roof project, you can have 75–100% of your insulation costs covered by the program, saving $2,000–$8,000 that you would otherwise pay out of pocket.
The roofing-insulation connection also has a direct impact on ice dam prevention. Ice dams form when heat escaping from an under-insulated attic melts snow on the roof, which refreezes at the cold eaves and backs up under the shingles. Upgrading insulation during a reroof addresses both the symptom (the new roof) and the root cause (the inadequate insulation) simultaneously. For more on ice dam prevention, see our Massachusetts ice dam prevention guide.
The Smart Homeowner Strategy
Step 1: Schedule your free Mass Save Home Energy Assessment 6–8 weeks before your planned roof replacement. Step 2: Get your insulation recommendations and rebate approval. Step 3: Coordinate the Mass Save-approved insulation contractor to work during or immediately after your reroof. Result: You save $2,000–$8,000 on insulation, prevent future ice dams, and reduce your heating bills by 15–30%.
Eligible Massachusetts Utilities
Mass Save is funded by the following utilities. If you receive your electric or gas bill from any of these providers, you are eligible for the free Home Energy Assessment and all associated rebates. Check your utility bill to confirm your provider.
Electric Utilities
- • Eversource — Serves eastern and western MA, largest electric utility in the state
- • National Grid — Serves central and southeastern MA, including Worcester and Fall River
- • Unitil — Serves Fitchburg and surrounding communities
- • Cape Light Compact — Serves Cape Cod and Martha's Vineyard
Gas Utilities
- • Eversource Gas — Formerly NSTAR Gas and Columbia Gas, serves eastern and central MA
- • National Grid Gas — Serves central and southeastern MA
- • Unitil Gas — Serves north-central MA communities
- • Berkshire Gas — Serves western MA (Berkshire County)
- • Liberty Utilities — Serves southeastern MA communities
Municipal Electric Customers: If you receive your electric bill from a municipal utility (such as Braintree Electric, Chicopee Electric, Holyoke Gas & Electric, or others), you are not part of Mass Save. However, many municipal utilities offer their own energy efficiency programs with similar insulation rebates. Contact your municipal utility directly to ask about available programs.
Mass Save Insulation Rebates: What's Covered
Mass Save insulation rebates cover multiple areas of your home. The rebate amount depends on your income level and the type of insulation work performed. All work must be recommended through the free Home Energy Assessment and performed by a Mass Save-approved insulation contractor to qualify.
Mass Save Insulation Rebate Amounts (2026)
| Insulation Area | Standard Rebate | Income-Eligible | Typical Cost |
|---|---|---|---|
| Attic insulation (blown-in) | 75% of cost | 100% free | $2,000–$5,000 |
| Wall insulation (dense-pack) | 75% of cost | 100% free | $3,000–$8,000 |
| Basement/crawlspace insulation | 75% of cost | 100% free | $1,500–$4,000 |
| Air sealing | 75% of cost | 100% free | $500–$2,000 |
| Duct insulation/sealing | 75% of cost | 100% free | $500–$1,500 |
Attic Insulation: The Roofing Connection
For homeowners planning a roof replacement, attic insulation is the most relevant Mass Save rebate. Massachusetts building code (780 CMR) requires a minimum of R-49 attic insulation for new construction and major renovations. Many older Massachusetts homes have R-19 or R-30 attic insulation, well below current code requirements. Upgrading to R-49 or R-60 during a reroof provides three major benefits:
1. Ice Dam Prevention
Proper attic insulation keeps heat inside your living space rather than escaping into the attic and melting roof snow. This is the single most effective ice dam prevention strategy. Combined with the new ice and water shield membrane installed during your reroof, upgraded insulation addresses both the cause and the symptom of ice dam damage. For Massachusetts homeowners who have experienced ice dams, this combination is the definitive solution.
2. Heating Cost Reduction
Upgrading from R-19 to R-49 attic insulation typically reduces heating costs by 15–30%, saving $300–$800 per year for the average Massachusetts home using gas heat. With Mass Save covering 75–100% of the insulation cost, the payback period on your remaining out-of-pocket investment (if any) is typically less than one heating season.
3. Roof Longevity
Proper attic insulation reduces the thermal cycling that shortens roof life in Massachusetts. When less heat escapes through the roof, the shingles experience fewer freeze-thaw cycles and less thermal stress. This can extend the effective lifespan of your new roof by 3–5 years, which is worth $2,000–$4,000 in deferred re-roofing costs.
Mass Save HEAT Loan: 0% Interest Financing
The Mass Save HEAT Loan (Home Energy Assessment to Loan) provides 0% interest financing for up to $50,000 over a 10-year term for qualifying energy efficiency improvements. While the HEAT Loan does not directly cover roof replacement costs, it can finance insulation upgrades, heating system replacements, and other energy efficiency work that you combine with your roofing project.
The HEAT Loan is particularly valuable when your 75% Mass Save insulation rebate still leaves a meaningful out-of-pocket cost. For example, if your attic insulation upgrade costs $4,000 and Mass Save covers 75% ($3,000), the HEAT Loan can finance the remaining $1,000 at 0% interest over 7 years, making your monthly payment approximately $12. When combined with the heating cost savings of $300–$800 per year, the insulation upgrade is cash-flow positive from day one.
HEAT Loan Details (2026)
Interest Rate
0% APR for the life of the loan. No origination fees, no prepayment penalties, no hidden costs.
Maximum Loan Amount
Up to $50,000 for qualifying energy efficiency improvements. Can cover insulation, air sealing, heating/cooling systems, water heaters, and windows/doors.
Loan Term
Up to 7 years for insulation work, up to 10 years for heating system replacements. Early repayment allowed with no penalties.
Eligibility
Must complete a Mass Save Home Energy Assessment first. Work must be performed by Mass Save-approved contractors. Basic credit check required (minimum 580 credit score at most participating lenders).
What It Does NOT Cover
The HEAT Loan does not cover roofing materials or roofing labor. It covers only energy efficiency improvements (insulation, air sealing, heating equipment). For roof financing, see our Massachusetts Roof Financing Guide.
Step-by-Step: Combining Mass Save with Your Roof Replacement
Timing is everything when combining Mass Save rebates with a roof replacement. Follow this sequence to maximize your savings and ensure smooth coordination between your roofing and insulation projects.
Schedule Your Mass Save Assessment (8 Weeks Before Reroof)
Call Mass Save at 1-866-527-7283 or visit masssave.com to schedule your free Home Energy Assessment. Mention that you are planning a roof replacement so the scheduler can prioritize your assessment timing. Wait times vary by season but typically range from 1–3 weeks. During the assessment, the auditor will evaluate your attic insulation, air sealing needs, and overall building envelope performance.
Review Your Assessment Report (6 Weeks Before)
You will receive a detailed report within 1–2 weeks of the assessment. The report specifies recommended insulation upgrades, estimated costs, and your rebate amount (75% or 100% depending on income eligibility). Share the attic insulation recommendations with your roofing contractor so they can plan coordination with the insulation crew.
Get Your Roofing Quotes (5–6 Weeks Before)
Get instant roof replacement quotes from pre-vetted Massachusetts contractors through RoofVista. When reviewing quotes, ask each contractor about their experience coordinating with Mass Save insulation contractors. Experienced Massachusetts roofers are familiar with this coordination and can schedule work so the insulation crew has access to the attic at the optimal time.
Schedule the Insulation Contractor (3–4 Weeks Before)
Mass Save will provide you with a list of approved insulation contractors in your area. Schedule the insulation work to begin 1–2 days after your roof replacement is complete. The insulation contractor can blow in cellulose or fiberglass while the new roof is in place and the attic is clean. Some homeowners have insulation done before the reroof so roofers can verify installation, but post-reroof is more common.
Roof Replacement Day(s)
Your roofing contractor completes the roof replacement, including new ice and water shield, underlayment, and roofing material. During the project, the contractor should ensure soffit vents are not blocked and ridge vent is properly installed to maintain attic ventilation balance. If installing baffles to protect soffit vents from blown-in insulation, the roofer can install these from the attic side during the reroof.
Insulation Installation (1–2 Days After Reroof)
The Mass Save-approved insulation contractor arrives to blow in new insulation, install baffles, and perform air sealing. For a typical Massachusetts home, attic insulation takes 1 day. The contractor will bring the attic to R-49 or R-60, install proper baffles at all soffit vents to maintain airflow, and seal air leaks around plumbing stacks, electrical penetrations, and recessed light fixtures.
Rebate Applied & HEAT Loan Finalized
The Mass Save rebate (75% or 100%) is applied directly to your insulation invoice, so you never pay the full amount. If you opted for the HEAT Loan to cover the remaining 25%, the loan is finalized after work completion. Your total out-of-pocket for insulation: $0 (income-eligible) to $500–$2,500 (standard 75% rebate on a $2,000–$10,000 project).
Air Sealing: The Hidden Savings in Every Mass Save Assessment
While insulation gets most of the attention, air sealing is equally important and is always included in Mass Save insulation projects at no additional cost. Air leakage accounts for 25–40% of heating and cooling energy loss in typical Massachusetts homes. Common air leak points in the attic include plumbing vent stacks, electrical wire penetrations, recessed light fixtures, attic hatches, chimney chases, and gaps around HVAC ducts.
During the Mass Save energy assessment, the auditor uses a blower door test to measure the total air leakage rate of your home in cubic feet per minute at 50 Pascals (CFM50). A typical older Massachusetts home tests at 3,000–5,000 CFM50, while a well-sealed home targets 1,500–2,500 CFM50. The air sealing work performed during the insulation installation can reduce your home's air leakage by 20–40%, which translates directly to lower heating bills and improved comfort.
For roofing purposes, air sealing the attic floor is critical because it prevents warm, moist air from entering the attic space. This warm air is what causes ice dams (by heating the roof deck from below) and attic moisture problems (by condensing on cold surfaces). The combination of air sealing + insulation + proper ventilation is the gold standard for preventing attic mold and ice dams in Massachusetts homes.
Common Insulation Problems in Massachusetts Homes
Many Massachusetts homes have insulation deficiencies that directly affect roof performance. Understanding these common problems helps you get the most value from your Mass Save assessment and coordinate effectively with your roofing contractor.
Blocked Soffit Vents
The most common insulation-related roofing problem in Massachusetts is blown-in insulation blocking soffit vents. When insulation is blown into an attic without proper baffles installed at the eaves, the insulation settles over the soffit vents and blocks the intake airflow needed for proper attic ventilation. This creates moisture buildup, mold growth on roof sheathing, and reduced effectiveness of ridge vents. During a reroof, your contractor should install proper ventilation baffles (like AccuVent or Durovent) at every soffit bay before the Mass Save insulation crew arrives.
Insufficient Attic Insulation Depth
Many Massachusetts homes built before 1990 have only 4–6 inches of attic insulation (R-13 to R-19), far below the current code requirement of R-49. Homes built in the 1970s and 1980s may have 8–10 inches (R-30), which was code-compliant at the time but still significantly below modern standards. The Mass Save program can bring your attic to R-49 or R-60 by blowing in additional cellulose or fiberglass over the existing insulation, provided the existing insulation is dry and free of mold.
Gaps Around Chimneys and Plumbing Stacks
The attic penetrations around chimneys, plumbing vent stacks, and electrical wiring are among the largest sources of air leakage in Massachusetts homes. A single 1-inch gap around a chimney chase can leak as much air as a small window left open year-round. Mass Save air sealing addresses these gaps with fire-rated caulk, metal flashing, and spray foam, reducing the warm air flow into the attic that drives ice dam formation and moisture problems.
Knee Wall and Cathedral Ceiling Insulation
Many Cape Cod and 1.5-story Massachusetts homes have knee walls (short walls between living space and attic on the upper floor) that are poorly insulated. These knee walls are a major source of heat loss and ice dam formation on the lower roof sections. Mass Save insulation contractors can dense-pack the knee walls and insulate the knee wall floor, which significantly reduces heat loss through these difficult-to-access areas.
Massachusetts Roofing Material Costs (2026)
When planning your combined roofing and insulation project, use these current Massachusetts roofing material prices to budget your total project cost. Remember that the Mass Save insulation rebate can offset $2,000–$8,000 of your overall project expense when coordinated properly.
Combined project savings example: A typical Massachusetts home with a $14,000 architectural shingle roof replacement and a $4,000 attic insulation upgrade pays $14,000 for the roof + $1,000 for insulation (after 75% Mass Save rebate) = $15,000 total. Without Mass Save, the same project would cost $18,000. That is $3,000 in savings plus ongoing heating cost reductions of $300–$800 per year.
Income-Eligible Benefits: 100% Insulation Coverage
Massachusetts households at or below 60% of the state median income qualify for enhanced Mass Save benefits, including 100% coverage of insulation costs with zero out-of-pocket expense. This is one of the most generous energy efficiency programs in the nation and can save income-eligible homeowners $3,000–$10,000 on insulation work.
Income-Eligible Qualification Paths
Income Threshold
Household income at or below 60% of state median income. For a family of four in Massachusetts, this is approximately $65,000–$70,000 annually (adjusted periodically). Single-person households qualify at approximately $45,000–$50,000.
Utility Discount Rate Programs
Enrollment in your utility's low-income discount rate (R-2 rate for Eversource or National Grid) automatically qualifies you for income-eligible Mass Save benefits.
Assistance Program Participation
Participation in SNAP (food stamps), LIHEAP (fuel assistance), MassHealth, SSI, or TAFDC qualifies you for income-eligible benefits without additional income verification.
Additional Income-Eligible Benefits
Beyond 100% insulation coverage, income-eligible households receive: free energy-efficient appliances and lighting, free smart thermostats, discounted heating system replacements (up to 100% off), and priority scheduling.
Plan Your Massachusetts Roof + Insulation Project
Get instant roof replacement quotes from pre-vetted Massachusetts contractors. Coordinate your Mass Save insulation rebate for maximum savings on your combined project.
Related Massachusetts Roofing Resources
Roof Replacement Cost in Massachusetts
Complete 2026 pricing for all 8 roofing materials across 30+ Massachusetts cities.
Ice Dam Prevention in Massachusetts
How proper insulation prevents ice dams and the damage they cause to Massachusetts roofs.
Attic Ventilation & Mold Prevention MA
Ventilation requirements and how to prevent mold when upgrading attic insulation.
Massachusetts Roof Financing Options
Compare HELOC, personal loans, and payment plans for your roofing project costs.
Skylight Installation Cost MA
How Mass Save insulation rebates complement skylight shaft insulation during reroof.
Massachusetts Roofing Building Codes
780 CMR insulation and ventilation code requirements for roofing projects.