Attic insulation in Boston
Mass Save offers 75 to 100 percent off approved insulation and air sealing for 1- to 4-unit homes, usually starting with a no-cost Home Energy Assessment.1
Discount
75–100% off approved insulation and air sealing.1
No-cost limit
A 4-person household earning up to $103,049 qualifies for no-cost upgrades in the 2026–27 season.2
Financing
0% HEAT Loan up to $25,000 for qualified improvements.1
Three ways in
- No-cost Home Energy Assessment with Mass Save's lead vendor.1
- A participating Home Performance Contractor can do the assessment and then the recommended work on a follow-up visit.1
- Direct weatherization: if you already know what you want, skip the assessment and use a Direct Weatherization Independent Installation Contractor.1
Customers must live in a 1- to 4-unit home, and some incentives depend on the assessment's findings.1 Mass Save notes that municipal utility customers aren't part of the program and should contact their utility.1
Income-based offers (2026–2027 heating season)
| Household size | No-cost program | Enhanced incentive |
|---|---|---|
| 2 | ≤ $70,073 | $70,074–$93,431 |
| 3 | ≤ $86,561 | $86,562–$115,415 |
| 4 | ≤ $103,049 | $103,050–$137,399 |
| 5 | ≤ $119,536 | $119,537–$159,382 |
Source: Mass Save.2
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Boston is in climate zone 5, where ENERGY STAR recommends R-60 for an uninsulated attic or adding R-49 over 3 to 4 inches.34 Mass Save lists fewer ice dams among the benefits of sealing and insulating.1
Choosing a contractor in Boston
- Ask whether they're a Mass Save Home Performance Contractor or Direct Weatherization contractor; that's what unlocks the discount.1
- Ask for the full price, the Mass Save share and your share in writing.
- On a municipal utility? Ask your utility about its own programs first.1
Areas we serve
We match homeowners across the Boston area, including these communities and ZIP codes:
- Boston02108 · 02109 · 02110 · 02111 · 02113 · 02114 · 02115 · 02116 · 02118 · 02119 · 02120 · 02121 · 02122 · 02124 · 02125 · 02126 · 02127 · 02128 · 02129 · 02130 · 02131 · 02132 · 02133 · 02134 · 02135 · 02136 · 02163 · 02199 · 02203 · 02205 · 02210 · 02215
- Cambridge02138 · 02139 · 02140 · 02141 · 02142
- Somerville02143 · 02144 · 02145
- Quincy02169 · 02170 · 02171
- Newton02458 · 02459 · 02460 · 02461 · 02462 · 02464 · 02465 · 02466 · 02467 · 02468
- Brookline02445 · 02446 · 02467
- Medford02155
- Malden02148
- Waltham02451 · 02452 · 02453
- Arlington02474 · 02476
- Needham02492 · 02494
- Lexington02420 · 02421
- Framingham01701 · 01702
- Dedham02026
ZIP codes are 2020 Census ZIP Code Tabulation Areas, which closely approximate USPS ZIP codes. We list ZIPs that make up a substantial share of each community, so edge ZIPs that barely touch a town are left out, and some ZIPs span two towns.6 Not on the list? Send the form anyway, and we'll tell you if we can help.
Common questions
How much does Mass Save pay for attic insulation?
Mass Save advertises 75 to 100 percent off approved insulation and air sealing improvements for 1- to 4-unit homes.
Who gets insulation at no cost?
Income-eligible households. For the 2026–2027 heating season, a 4-person household qualifies at up to $103,049, with enhanced incentives up to $137,399.
Do I need a Home Energy Assessment first?
Usually, but Mass Save also lets you skip it and work directly with a Direct Weatherization Independent Installation Contractor.
Is there still a federal tax credit for insulation?
No. The IRS says the Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025.
General information summarized from the public sources listed below. It isn't professional, engineering or legal advice. Codes and programs change; confirm current requirements with your local building department or utility before you start.
Sources
- Mass Save, "Insulation & Air Sealing"
- Mass Save, "Income-Based Assistance" (2026–2027 heating season income limits)
- U.S. Department of Energy, Building America, "Climate Zones" (IECC climate zone map)
- ENERGY STAR, "Recommended Home Insulation R-Values"
- U.S. EPA, "Protect Your Family from Asbestos-Contaminated Vermiculite Insulation"
- U.S. Census Bureau, 2020 ZIP Code Tabulation Area relationship files