Mass Save® is the most generous home energy rebate program in the United States. Massachusetts homeowners can receive 75–100% of qualifying insulation and air sealing project costs covered — meaning many qualifying homeowners may pay significantly less out of pocket.
As a certified Mass Save Independent Installation Contractor based in East Boston, MA, we help Greater Boston homeowners navigate this program every day. Here's everything you need to know for 2026.
What Is Mass Save?
Mass Save is a statewide energy efficiency program run by Massachusetts electric and gas utilities — including Eversource, National Grid, and others. It's funded by a small surcharge on your utility bills, which means you've already paid into it. The program offers rebates, financing, and free home energy assessments to help reduce residential energy consumption.
What Does Mass Save Cover in 2026?
| Service | Rebate Coverage | Notes |
|---|---|---|
| Attic Insulation | 75–100% | Must meet R-49 minimum |
| Air Sealing | 100% | Often done with insulation |
| Basement Insulation | 75% | Walls and rim joists |
| Spray Foam (qualifying) | 75% | Closed cell at rim joists |
| Heat Pump / HVAC | Up to $10,000 | Separate program |
How to Qualify
- You must be a Massachusetts residential utility customer
- You need a free Home Energy Assessment first (done by Mass Save energy auditor)
- Work must be completed by a certified Mass Save contractor — like Smooth Construction
- Rebates are applied at invoice — you never pay the full amount upfront
The Process — Step by Step
- Schedule your free Home Energy Assessment at masssave.com or call 1-866-527-7283
- Receive your assessment report — it lists every improvement that qualifies for rebates in your home
- Contact a certified contractor (us) — we'll review the report and provide a free estimate
- We complete the work and submit all rebate paperwork on your behalf
- Rebate applied at invoice — you pay only your portion (often $0–$300 on a $2,000+ project)
0% Financing Available
For improvements beyond what rebates cover, Mass Save also offers 0% interest HEAT Loans up to $25,000 for qualifying homeowners. This means you can do your attic, basement, and air sealing in one visit — and pay nothing for months.
Smooth Construction is a certified Mass Save contractor. We review your assessment report, explain exactly what's covered, and file all paperwork. Call 857-214-2434 or request a free estimate.
More reading: Weatherization Services · Attic Insulation · Air Sealing · Open Cell vs Closed Cell Guide
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