Money · Efficiency Maine
Efficiency Maine Insulation & Air Sealing Rebates
Efficiency Maine Trust — the independent, quasi-state agency that administers Maine's energy efficiency programs — pays a substantial share of the cost of professionally installed insulation and air sealing in existing Maine homes. Here's how the weatherization rebates work, who qualifies for what, and how the process runs from assessment to check.
The program
Weatherization rebates under the Home Energy Savings Program
Efficiency Maine Trust was created by the Legislature (35-A M.R.S. ch. 97) and is funded by a system benefits charge on Maine utility bills plus federal program funds — meaning every Maine ratepayer already contributes, and the rebates are how that money comes back. Its Home Energy Savings Program (HESP) treats air sealing and insulation together as "weatherization" — the same seal-first pairing that BPI building science prescribes — and rebates a percentage of the project cost, tiered by household income.
As of the current program period, the weatherization rebate structure works like this (verify current figures at efficiencymaine.com before you sign anything — amounts and deadlines change):
| Tier | Who qualifies | Rebate |
|---|---|---|
| Any income | All Maine homeowners; no income verification | A percentage of project cost up to a cap of several thousand dollars (recently 40% up to $4,000) |
| Moderate income | Income-verified against program AGI thresholds | A higher percentage and cap (recently 60% up to $6,000) |
| Low income | Verified via participation in HEAP, SNAP, TANF, or income-based MaineCare (or program income limits) | The highest percentage and cap — recently 80% up to $8,000 |
Caps are lifetime limits per building. Efficiency Maine has also administered federally funded enhanced offers for income-eligible households at higher levels; program periods carry completion deadlines (for example, the current insulation offer requires upgrades completed within the announced program window). The authoritative, current numbers are always the ones on Efficiency Maine's insulation rebates page.
On real projects the math is decisive. A representative $10,000 attic air-sealing-plus-insulation project can net to roughly $6,000 at the any-income tier, $4,000 at moderate income, and about $2,000 at the low-income tier. Rebates also stack with Efficiency Maine's heat pump and heat pump water heater rebates on whole-home projects — and weatherizing first lets the heat pump be sized smaller and run cheaper, which is why Efficiency Maine has offered bonuses for combining them.
The rules that matter
What qualifies — and why the vendor requirement exists
Qualifying work
- Air sealing of the attic plane, basement, and envelope penetrations — nearly always scoped with, or ahead of, the insulation
- Attic insulation — typically blown cellulose brought toward current-code levels
- Wall insulation — dense-pack cellulose into existing closed cavities
- Basement, crawl space, and rim joist insulation — rigid board, spray foam, and sealed crawl assemblies
- Related blower door testing and assessment work
The ground rules
- Work must be performed by an Efficiency Maine Residential Registered Vendor — DIY work does not qualify.
- The home must be an existing, year-round Maine residence (new construction and additions are served by the code, not the retrofit rebate).
- Projects are documented with pre- and post-work assessment — including blower door numbers — to program specifications.
- One rebate per upgrade; processing takes several weeks unless your vendor applies it directly to the invoice.
Why Efficiency Maine requires a Registered Vendor
The vendor rule is quality control, not gatekeeping. Registered Vendors agree to program installation specifications built on the same building-science canon as BPI's standards: seal before insulating, verify with a blower door, maintain ventilation and combustion safety in a tightened house, and document the R-values and coverage actually installed. The program is buying measured performance, not bags of insulation — which is also what protects you as the homeowner.
Financing the remainder
Efficiency Maine also runs low-interest Green Bank / home energy loans that can finance the post-rebate balance of qualifying weatherization (and related health-and-safety work needed to complete it), with additional options through MaineHousing programs for income-qualified households and PACE financing in participating municipalities. A typical package: rebate applied at invoice, remainder financed at program rates, monthly payment substantially offset by the fuel savings.
Note on federal credits
The federal 25C Energy Efficient Home Improvement tax credit that many homeowners stacked on top of these rebates expired for projects after December 31, 2025. Efficiency Maine's rebates are state-administered and continue — they are now the primary incentive for Maine insulation work. If federal incentives return, a good installer will fold them into your quote.
Start to finish
How a rebated project runs
- Assessment. The installer evaluates the attic, walls, basement, and ventilation, runs a blower door baseline, and screens combustion safety.
- Scope & rebate math. You get a written scope with the exact rebate tier you qualify for and your net cost. Income verification, where it applies, is handled through Efficiency Maine's process.
- The work. Air sealing first, then insulation, installed to program specifications and to the code duties your project carries (see code-triggered upgrades).
- Verification. Post-work blower door, photos, and documentation submitted to Efficiency Maine.
- The money. The rebate is applied per program rules — and a Registered Vendor walks you through the paperwork rather than leaving it on your kitchen table.
Find out your tier and your net cost
Bring one of our recommended installers your address and your goals; they'll bring the blower door and the current rebate sheet. Most homeowners are surprised by how little the net number is.
Get Your Rebate-Ready Quote