Maine Insulation Rebates: How Much You Can Get in 2026

Editor's note (October 2026): This guide was updated for Efficiency Maine's October 1, 2026 rebate schedule. Insulation and air sealing rebates are now a fixed amount per zone of the house, not a percentage of project cost. Work completed on or before September 30, 2026 falls under the previous schedule. The federal 25C tax credit expired December 31, 2025.

Editor's note (March 2026): The federal 25C tax credits referenced in this article expired December 31, 2025 and are only available for qualifying work completed before that date. Efficiency Maine rebates remain available and are now the primary incentive for insulation projects.

Historical example (fall 2025, under the schedule in effect before October 1, 2026): Here is a real project from last fall: attic and rim joist insulation on a home in Gorham. The project estimate came to $6,200. After applying the Efficiency Maine rebate ($3,200) and the federal 25C tax credit ($930, available for work completed before 12/31/2025), the out-of-pocket cost was $2,100. Most homeowners are surprised by that number. These figures reflect the rebate schedule and federal credit in effect at the time. Neither applies to new projects; see the current table below.

Maine has one of the most generous insulation rebate programs in the country, and most homeowners either do not know it exists or underestimate how much it covers. Here is how the program works for work completed on or after October 1, 2026, what you qualify for, and what the process looks like from start to finish.

How Much the Maine Insulation Rebate Covers

Efficiency Maine's weatherization rebates cover insulation and air sealing. The rebate is a fixed dollar amount for each zone of your home: the attic, the walls, and the basement. You can claim one insulation rebate and one air sealing rebate per zone. The amount depends on your income tier and the size of the zone:

The lifetime limit covers all insulation and air sealing rebates on the building combined. Adding up three large zones plus the three air sealing rebates gives $12,600 at the low-income tier and $9,450 at the moderate tier, so both stop at the $8,600 limit. At the any-income tier the same rows add up to $6,300, below the limit.

Income tier definitions:

• Any Income: No verification needed. All Maine homeowners qualify.
• Moderate Income: Adjusted gross income up to $70,000 for individual tax filers, or $100,000 for joint filers.
• Low Income: Verified participation in HEAP, SNAP, TANF, or MaineCare by a homeowner or a member of the homeowner's household.

Rebates are income-dependent, and the right zones for your home come out of your free energy assessment.

What Work Qualifies for the Rebate

The rebate covers professional insulation installed by an Efficiency Maine Residential Registered Vendor. Qualifying work includes:

• Attic insulation. Blown insulation to current code levels (R-49, which is about 16 inches of cellulose). We install blown-in cellulose for its fire resistance, zero off-gassing, and long-term performance. This is the most common project we do.
• Wall insulation. Dense-pack cellulose blown into existing exterior wall cavities. No drywall removal needed. Mobile home walls are not part of the wall zone.
• Basement and foundation insulation. The floor between living space and an unheated basement, or the concrete foundation walls and rim joists.
• Mobile home underbelly. The space beneath the floor of a mobile home that is not on a foundation.
• Air sealing. Sealing accessible air leaks in the attic, the basement or underbelly, and the living space. We almost always air seal before insulating.

DIY insulation does not qualify. The insulated space must be heated through the whole heating season, and the work has to follow Efficiency Maine's weatherization requirements.

How Rebates Reduce Your Cost

Here is how the per-zone amounts play out. These are illustrations, not quotes.

Example: Attic insulation + air sealing for a moderate-income homeowner

Example: Whole-home weatherization (attic, walls, basement), all large zones

We apply the Efficiency Maine rebate directly to your invoice. You pay the net amount, with no waiting for reimbursement.

Schedule a free energy assessment and we will give you exact rebate numbers for your project, based on your home and your income tier.

How the Rebate Process Works (Step by Step)

Step 1: Free energy assessment. A registered contractor (like us) walks through your home to evaluate your current insulation levels, air leakage areas, and heating system. The assessment is a free visual walkthrough and helps us build your roadmap. Blower door testing happens as part of the work itself.

Step 2: Proposal with rebate calculations. You receive a detailed proposal showing the recommended work by zone, total cost, Efficiency Maine rebate amount, and your net cost. If income verification is needed, we help you through that process before the work starts.

Step 3: Work is performed. The insulation and air sealing work is completed. For most homes, this takes one to three days depending on the scope.

Step 4: Rebate claim. The claim must be submitted within six months of completion. We handle the paperwork.

Step 5: Rebate applied. The rebate is deducted directly from your invoice. You pay only the net amount.

Common Questions About Maine Insulation Rebates

Do I need to verify my income to get the rebate? Not for the any-income tier, which pays $2,000 per large zone and $1,000 per small zone. Income verification is only required for the higher moderate-income or low-income amounts.

Can I get the rebate if I already have some insulation? Yes. The rebate applies to bringing your insulation up to current code levels. If your attic has R-11 (about 4 inches of old fiberglass) and we blow it up to R-49, that qualifies.

Does air sealing qualify separately? Yes. Each zone can earn one insulation rebate and one air sealing rebate, and both count toward the same lifetime limit.

Is there a deadline? The claim must be submitted within six months of completion. Efficiency Maine can change or end the program at any time.

Can I do the work myself and still get the rebate? No. The work must be performed by an Efficiency Maine Residential Registered Vendor.

What types of insulation qualify? We install blown-in cellulose and polyiso rigid foam board because they perform best for Maine homes. The installed work has to meet Efficiency Maine's weatherization requirements.

What Most People Get Wrong

Assuming they do not qualify. Every Maine homeowner qualifies for at least the any-income amounts with no income verification. The moderate-income tier covers adjusted gross income up to $70,000 for individual filers or $100,000 for joint filers, which includes a lot of working families.

Insulating without air sealing first. Air sealing stops warm air from escaping through gaps and cracks. Insulation slows heat transfer through surfaces. If you insulate an attic without sealing the penetrations in the attic floor, warm air still rises through those gaps and bypasses the insulation. We always seal first, then insulate, and the per-zone rebate pays for both.

Get Your Rebate-Adjusted Price

Every home is different, and the rebate depends on which zones your home needs and which income tier you qualify for. Our free energy assessment gives you the specific numbers: what insulation your home has now, what it needs, the total project cost, and your net cost after rebates.

Schedule your free energy assessment and we will show you what your insulation project costs after Efficiency Maine rebates. Or call us at (207) 221-3221.