The federal credit most cost pages are still advertising has closed

The Energy Efficient Home Improvement Credit, section 25C of the tax code, gave 30 percent ^[1] of certain qualified expenses back as a credit, with a separate annual cap of $2,000 ^[2] for heat pumps, heat pump water heaters, biomass stoves and biomass boilers. On a single-zone job the thirty percent usually governed. On anything multi-zone, the cap governed, which is why almost every multi-zone quote you saw advertised exactly two thousand dollars of savings regardless of its size.

The credit was non-refundable, meaning it reduced tax owed rather than generating a payment, and it was annual rather than lifetime — a genuinely useful design if you were staging work across two calendar years, which is a strategy that no longer applies.

Retrieved 2026-08-06, the agency’s own page for this credit states plainly: “You can claim the credit for improvements made through December 31, 2025.” The same page frames the qualifying window as property placed in service on or after 1 January 2023 and before the end of 2025.

One wrinkle worth knowing if your work was done in 2025: the page notes that for items placed in service that year, a credit is only allowed where the item came from a qualified manufacturer and the return lists that manufacturer’s identification number. Insulation and air sealing materials are the exception. If you are claiming for a 2025 installation, that number needs to come from your installer or the manufacturer, and it is easier to ask for now than in April.

Three practical consequences, in order of how much money they move.

First, if a contractor’s proposal shows a net cost after federal credit, that line is stale and the real number is the gross one. This is not usually dishonesty; proposal templates outlive tax provisions. Ask for the figure without it and compare bids on that basis.

Second, the economics of the efficiency step change. The credit disproportionately subsidised the more expensive, higher-efficiency, cold-climate-certified equipment, because that equipment cost more and thirty percent of more is more. Without it, the payback case for stepping up a tier now rests entirely on your own run hours and your own electricity price — which is exactly what the running-cost worksheet is for, and why that worksheet leads with a per-hour figure you can multiply by your own honest guess at usage.

Third, state and utility programmes are now doing all the work, and they vary far more than the federal credit did. Some are point-of-sale discounts, some are post-installation rebates requiring a specific certified installer, and several are income-qualified. None of them are on this site, because tracking fifty states of programme rules accurately is a full-time job and a stale rebate figure is worse than none at all — which is, after all, the exact failure this page exists to correct.