Was Your HVAC Installed in Time for a Federal Energy Tax Credit?

Quick result as of September 23, 2026: A homeowner’s new heat pump, central air conditioner, furnace, boiler or geothermal system generally had to have its original installation completed by December 31, 2025 to qualify for the federal home energy credits discussed here. Paying a deposit, signing a contract or having equipment delivered by that date was not enough.

The installation deadline has passed, but the filing opportunity may not have. If qualifying work was completed in 2025 and omitted from your return, you may still be able to amend that return.

Choose your upgrade and enter the install or purchase date to see whether the credit still applies and what it is worth.

The HVAC deadline checker

1. Was the original installation completed by December 31, 2025?

• Yes: Continue to Step 2.
• No: A 2026 completion does not qualify for either the Energy Efficient Home Improvement Credit under Section 25C or the Residential Clean Energy Credit under Section 25D.
• Only ordered, paid for or delivered in 2025: That does not move a 2026 installation into the 2025 credit year.

The 2025 Form 5695 instructions say costs for both credits are treated as paid when original installation is completed. For costs tied to construction or reconstruction, the timing can instead depend on when the taxpayer’s original use begins. The IRS also confirms that the credits ended for qualifying property or expenditures after December 31, 2025 in its guidance on the accelerated termination dates.

2. Which HVAC equipment was installed?

For qualifying property completed in 2025, the possible federal credit depends on the equipment category:

Equipment	2025 credit framework	Main limit
Air-source electric or natural-gas heat pump	30% of eligible cost, including installation labor	Up to $2,000 for the year, shared with heat-pump water heaters and qualifying biomass equipment
Central air conditioner	30% of eligible cost, including installation labor	Up to $600 per item; also subject to the $1,200 annual Section 25C bucket
Natural-gas, propane or oil furnace or hot-water boiler	30% of eligible cost, including installation labor	Up to $600 per item; also subject to the $1,200 annual Section 25C bucket
Geothermal heat pump	30% of eligible cost, including qualifying installation work	No general annual dollar cap under Section 25D

These amounts are ceilings, not automatic rebates. Equipment must satisfy the applicable efficiency rules. For example, 2025 air-source heat pumps and central air conditioners generally had to meet the highest applicable Consortium for Energy Efficiency tier, excluding an advanced tier. Geothermal heat pumps had to meet the Energy Star requirements in effect when purchased. The IRS lists the eligible Section 25C equipment, efficiency rules and limits, while its Residential Clean Energy Credit guidance covers geothermal systems.

A repair invoice does not establish that a replacement component is eligible property. Ask the contractor or manufacturer to identify the exact equipment and qualifying standard rather than relying on wording such as “high efficiency.”

3. Did the home and taxpayer qualify?

For the Section 25C credit covering air-source heat pumps, central AC and qualifying furnaces or boilers, the property generally had to be:

• New rather than used;
• Installed in an existing U.S. home, not a newly built home; and
• Installed in the taxpayer’s main home in most cases.

A landlord who did not live in the property generally cannot claim this homeowner credit. Business use can also reduce or eliminate the eligible amount.

The Section 25D rules for geothermal are different. They can cover a new or existing U.S. residence, and some second homes may qualify. Check the applicable rules rather than transferring the main-home test from one credit to the other.

4. Do you have the 2025 equipment identifier?

A 2025 Section 25C claim for covered HVAC equipment requires the four-character alphanumeric Qualified Manufacturer Identification Number (QMID) for each item. The 2025 Form 5695 instructions explain this reporting requirement.

Before filing, assemble:

• The final invoice and proof of payment;
• The installation-completion date;
• The manufacturer, full model number and serial number;
• The QMID for each covered Section 25C HVAC item;
• Manufacturer documentation showing that the model met the applicable 2025 efficiency tier;
• Itemized equipment and labor charges; and
• Records of rebates or utility subsidies that may reduce eligible cost.

Do not use the serial number or model number as a substitute for a QMID. Check the manufacturer’s tax-credit documentation or ask the manufacturer to confirm the identifier for the exact model.

5. Are you filing for the correct tax year?

A system completed in 2025 belongs on the 2025 federal return, normally using Form 5695. It does not become a 2026 credit because the bill was paid later or the return is filed later.

If a 2025 return was already filed without the credit, the IRS says it can generally be amended. A refund claim normally must be filed within three years after the original return was filed or two years after the tax was paid, whichever is later; individual circumstances can change that calculation. See the IRS timing guidance for amended energy-credit claims.

Section 25C is nonrefundable, and unused credit cannot be carried forward. Section 25D is also nonrefundable, but an unused residential clean energy credit may be carried forward. That difference can affect the usable benefit.

Related federal deadlines at a glance

These dates follow different rules from the HVAC credits:

• Residential EV charging equipment: It had to be placed in service by June 30, 2026, and the main-home location had to be in an eligible low-income or non-urban census tract. For individuals, the credit was generally 30% of cost, up to $1,000 per item. The IRS charging-property page explains the census-tract and Form 8911 requirements.
• New and previously owned clean vehicles: The vehicle generally had to be acquired by September 30, 2025. A binding written contract plus a payment by that date could establish acquisition, even if possession came later, according to the IRS clean-vehicle guidance. The vehicle still had to satisfy the other eligibility and placed-in-service requirements.

State rebates, utility incentives and federal home-energy rebate programs have their own availability and deadlines. They do not reopen an expired federal tax credit, but they may affect project cost or the amount treated as eligible for a prior-year claim. Confirm tax treatment with a qualified tax professional and equipment eligibility with the manufacturer before amending a return.