Massachusetts Insulation Rebates
Get up to $4,000 in rebates for insulation and weatherization through Mass Save. Income-qualified households get 100% free insulation.
Quick Summary
Why Insulation Matters
Many Massachusetts homes, especially older ones, lack adequate insulation. This leads to higher energy bills, uncomfortable temperatures, and wasted energy.
Save 15-25% on Energy
Proper insulation can reduce heating and cooling costs by hundreds of dollars per year
Improved Comfort
Eliminate cold drafts, hot spots, and temperature swings between rooms
Prepares for Heat Pump
Insulation is often required before installing a heat pump for best results
2026 Insulation Rebate Amounts
Rebates are applied directly to your project cost - you only pay the difference.
| Insulation Type | Standard Rebate | Income-Qualified |
|---|---|---|
| Attic Insulation | Up to $2,000 | No Cost (100% covered) |
| Wall Insulation | Up to $2,000 | No Cost (100% covered) |
| Basement/Crawl Space | Up to $1,500 | No Cost (100% covered) |
| Air Sealing | Up to $750 | No Cost (100% covered) |
| Rim Joist Insulation | Included | No Cost (100% covered) |
Income-Qualified? Get Free Insulation
If your household income is at or below 60% of State Median Income, you may qualify for 100% free insulation and air sealing. No cost to you at all.
Check income eligibilityTypes of Insulation Covered
Mass Save covers various insulation types depending on your home's needs.
Attic Insulation
- Blown-in cellulose or fiberglass
- Target R-value: R-49 or higher
- Air sealing at penetrations included
Wall Insulation
- Dense-pack cellulose
- Minimally invasive installation through small holes
- Fills empty wall cavities completely
Basement & Crawl Space
- Rigid foam board or spray foam
- Rim joist insulation included
- Helps prevent frozen pipes
Air Sealing
- Seals gaps around pipes, wires, and ducts
- Weatherstripping for doors and windows
- Reduces drafts and improves comfort
How the Process Works
Getting insulation rebates through Mass Save is straightforward. Here's what to expect.
Schedule Assessment
Book a free Home Energy Assessment online or by calling 866-527-7283
Home Visit
Energy specialist visits your home to assess insulation and identify air leaks using blower door test
Get Recommendations
Receive a detailed report with recommended improvements and rebate amounts
Choose Contractor
Select from Mass Save approved insulation contractors
Installation
Contractor completes work and files rebate paperwork on your behalf
Pay Net Cost
You only pay your portion - rebate is applied directly
Or call 866-527-7283
Stack with Federal Tax Credits
After your Mass Save rebate, you can claim an additional 30% federal tax credit on your remaining costs through the Energy Efficient Home Improvement Credit (25C).
- 30% of insulation material and labor costs
- Up to $1,200 per year for insulation
- Claim on your federal tax return
Example: Whole-Home Insulation
Eligibility Requirements
Requirements
- Must be a customer of a Mass Save participating utility
- Home must be in Massachusetts
- Must complete a free Home Energy Assessment first
- Work must be performed by a Mass Save approved contractor
- Primary residence (owner-occupied or rental)
Participating Utilities
Municipal utility customers may have different programs. Check municipal utilities
Get the Free Rebate Toolkit
Federal tax credits, stacking rules, and claiming checklist - all in one PDF.