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Connecticut · checked October 20, 2026
Insulation and air sealing rebates in Connecticut
1 program pays toward insulation and air sealing in Connecticut right now, with 3 separate offers between them. The largest stated amount is $10,000, from Energize CT residential insulation incentive (Professional install). The federal 25C credit for this upgrade ended on December 31, 2025, so the state and utility money below is what is left.
What Connecticut pays for insulation and air sealing
Energize CT residential insulation incentive Open
Run by Energize CT (Eversource, UI, CNG, SCG) · for customers of 4 utilities · ends December 31, 2026
- Professional install: Lesser of $2.00 per sq ft or 75% of cost, up to $10,000
- Income-qualified or EJ community: Up to $2.50 per sq ft (EJ community projects capped at $15,000) income-qualified
- HES Income Eligible: No-cost insulation, up to 100% of cost, through Home Energy Solutions – Income Eligible low income
Conditions on the program page: Recommended during a Home Energy Solutions visit and approved before installation; Insulation Installers Network contractor; Up to 4 units; Attic floors: existing R-value no more than R19, finished R49 (R38 where R49 is not practicable).
Also on the page: Self-installation: $0.25 per sq ft for approved projects.
Source: Energize CT: Residential insulation. Last checked October 20, 2026. Official program page.
Worked example: one Connecticut home
Take 1,000 square feet of attic insulation across 2 large zones, on a project that costs $5,000, in a home heated with oil. These are example inputs, not typical prices. Each program's own rule gives the amounts below; where one program has several tiers only the largest one counts, separate programs add up, and a percentage offer with no cost entered is shown at its ceiling.
| Utility | Not income-qualified | Moderate income | Low income |
|---|---|---|---|
| Eversource (Connecticut) | $2,000 | $2,500 | $5,000 |
| United Illuminating (UI) | $2,000 | $2,500 | $5,000 |
| Connecticut Natural Gas (CNG) | $2,000 | $2,500 | $5,000 |
| Southern Connecticut Gas (SCG) | $2,000 | $2,500 | $5,000 |
For a household that is not income-qualified, the example comes to $2,000, made of $2,000 from Energize CT insulation (Professional install). A household that meets a program's low-income definition gets $3,000 more in the same example, because 1 offer is paid at the income-qualified level. All 4 listed utilities come out the same, because the money comes from a shared program.
Who can use these Connecticut offers
Every household in Connecticut covered by Energize CT can apply; the offers are not limited to one utility's territory. Customers of Municipal utility are not covered by any open insulation and air sealing offer listed here; check with the utility directly. The earliest end date among these offers is December 31, 2026.
Federal credit and state IRA rebates
The Energy Efficient Home Improvement Credit (IRC §25C) paid 30% of insulation and air-sealing materials, within the $1,200 annual limit (labor not included). The IRS page says: “can claim the credit for improvements made through December 31, 2025.” Not allowed for property placed in service after December 31, 2025. Source: IRS: Energy Efficient Home Improvement Credit, 26 U.S.C. §25C, as amended by Public Law 119-21 (July 4, 2025). See what the credit covered and when it ended.
Connecticut HEEHR (formerly HEAR) and HOMES (formerly HER): Not launched. “Rebates will not be available until the programs are launched.” In June 2026 DEEP reported it was “actively reviewing the new guidance” DOE issued on June 1, 2026; no launch date is given. Source: CT DEEP: Inflation Reduction Act Home Energy Rebate Programs (updated July 2025).
How Connecticut compares
Connecticut has the largest stated insulation and air sealing amount of the 15 states this site covers. Open elsewhere: Maine $8,600; Vermont $7,000; New Hampshire $6,000; Massachusetts $5,000; North Carolina $1,600; Oregon $1,500; Wisconsin $1,475; Arizona $600. No open, sourced offer is listed in 6 other covered states (California, Florida, Michigan, Pennsylvania, Rhode Island, Texas). Compare them on the insulation and air sealing rebates by state page.
Other upgrades in Connecticut: air-source heat pump, heat pump water heater, home EV charger. Background: how rebates stack and the federal credit status.
Rebates are set by each program and can change or close without notice; the program's own page and application decide what is paid. This page is information, not tax, legal or financial advice. Amounts last checked October 20, 2026.