Insulation in Massachusetts.
MassSave covers 75-100% of attic, wall, and basement insulation, plus air sealing, on every income tier. The audit is free. The work usually starts within 30 days.
Gas bills have climbed every year.
Massachusetts residential gas climbed from $1.30/therm in 2010 to $1.85/therm by 2025. Insulation cuts your usage by 20-30% on day one, so your bill drops by that much before the rate goes up.
What a whole-home insulation project actually pays back.
A BPI-certified energy audit identifies where your home leaks heat, attic, walls, basement, around windows and doors. The rebate stack below shows what Massachusetts pays back on day one. The red line shows what staying with your current envelope costs you over 15 years.
See the pieces of the stackThe numbers that make Massachusetts insulation pencil.
Four reasons your insulation project pays you back on day one.
Every rebate line, spelled out.
Current 2026 rebate amounts for MassSave Weatherization. Locked in at the time of pre-approval.
- Attic insulation75% covered (market rate)
- Attic insulation (income-qualified)100% covered
- Wall insulation75% covered
- Basement/crawl insulation75% covered
- Air sealing (blower door test)Included with insulation
- Duct sealingIncluded
- Free home energy assessmentNo cost
From first call to a tighter envelope.
A typical Massachusetts insulation project runs 2–4 weeks from BPI audit to install completion.
The honest FAQ.
Actual questions that come up in the first installer conversation, answered for a typical Massachusetts homeowner in 2026.
Is the free assessment really free?
Yes. Zero cost, and you receive free instant upgrades during the visit (typically LEDs, smart thermostats, and water-saving devices) along with a written report.
Can I weatherize without a heat pump project?
Yes. Weatherization is a standalone program. Most homeowners do it before or independently of heat pump conversion, the payback on insulation alone is under 2 years for most oil-heated homes.
Do I have to use the contractor MassSave recommends?
You must use a MassSave-participating contractor to get the rebate, but you can choose among several. We match you with one pre-vetted local partner to save you the vetting work.
Other states and programs.
Looking for the same kind of program in another state, or a different program in yours? Tap any pill to jump.
Ready to see how MassSave Weatherization applies to your home?
Your Home Efficiency Score shows your exact rebate stack, across this program and every other one you qualify for in 2026.
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