Mass Save / Eversource & National Grid
Mass Save Insulation & Air Sealing is available to homeowners and renters in Cambridge, MA.
Mass Save provides rebates covering 75% of insulation and air sealing costs for all customers, with 100% coverage for income-eligible households. Includes attic, wall, and basement insulation.
Estimate based on 75% rebate for typical whole-home insulation project
Official program page checked live on 2026-06-22.
Data last verified 2026-05-25. How we verify our data.
In Cambridge, MA, you can combine this program with other local help to cut your cost:
A grant-savvy contractor in Cambridge, MA can handle the paperwork, inspections, and timelines so your funding releases on schedule. Getting matched is free.
This grant requires a licensed contractor
This grant requires the work to be done by a licensed contractor, and you will likely need a written estimate to apply. Get a free estimate from a contractor in Cambridge who knows grant paperwork.
Get matched with a contractorEach program sets its own contractor rules. Check the official program page for exact requirements.
Mass Save offers this rebate to its residential customers who install the qualifying energy-efficient equipment this program covers. You apply through the utility's rebate program, usually online with your account, your paid invoice, and the equipment's model or efficiency rating. Many rebates are submitted by a participating contractor and paid after the equipment is installed, so confirm the current rebate and rules on the official page first.
Steps to apply
Documents you will likely need
Requirements vary by program and locality. Confirm the exact rules on the official program page. We can help you prepare your paperwork, but you submit it yourself.
Deadline: Ongoing
Ask us. It is free, and a real person answers within a business day.
Email us about this program75-100% of cost covered.
Mass Save Insulation & Air Sealing is open to homeowners and renters in Cambridge, MA. It has no income limit.
Apply directly with Mass Save / Eversource & National Grid using the official program link on this page or call (866) 527-7283. There is no middleman and no fee.
Grant-approved contractors understand the documentation, inspections, and timelines, so your funding releases on schedule.
Rebates and discounts that stack on top of any grant. Most are free to use.
This is just one of many grants, rebates, and free programs available. Stack them together to maximize your savings.
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