Replacement Windows in Connecticut

Rebates & incentives

The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.

Connecticut's IRA Home Energy Rebates are administered by the Department of Energy and Environmental Protection (DEEP), which had received its full federal allocation for both the Home Electrification and Appliance Rebates and Home Efficiency Rebates programs. As of mid-2026 DEEP was launching the programs on a rolling basis pending DOE approval, with the Home Efficiency track targeted for 2026, so rebates may not yet be available. Windows would generally qualify only through the whole-home Home Efficiency Rebates track on a modeled-savings basis; confirm current status with DEEP before promising rebates.

• Energize CT Triple-Pane Window Rebate. Through the Energize Connecticut program, Eversource and United Illuminating customers can get a rebate (around $100 per window as of mid-2026) for installing qualifying ENERGY STAR-certified triple-pane windows, one of the few utility programs in these states that rebates windows directly; verify the current per-window amount and that the program is still running, as Energize CT rebate offerings were slated to change at the end of 2026. (Energize Connecticut (energizect.com))

Energy code

Connecticut's residential energy code is based on the 2021 IECC (the 2022 Connecticut State Building Code, mandatory for permits after October 1, 2022), enforced locally in Hartford under the state building official. In the Northern climate (IECC zone 5A) specify a low U-factor rated replacement window to comply.

Local market research in Connecticut

• Replacement windows in Hartford, CT covers costs, codes, rebates, and local FAQs.
• Replacement windows in New Haven, CT covers costs, codes, rebates, and local FAQs.
• Replacement windows in Bridgeport, CT covers costs, codes, rebates, and local FAQs.
• Replacement windows in Waterbury, CT covers costs, codes, rebates, and local FAQs.
• Replacement windows in New London, CT covers costs, codes, rebates, and local FAQs.