HVAC systems that meet the 2024 tax credit requirements

The 2024 tax credit covers central air conditioners, heat pumps, and furnaces that meet specific efficiency ratings set by the Department of Energy. The credit does not cover window units, portable air conditioners, or space heaters. Your system must be installed in your primary residence — not a rental property or second home — and the installation must happen in the tax year you claim the credit.

The efficiency threshold varies by system type and your climate zone. A central air conditioner in most of the country must have a SEER2 rating of at least 16 to may have access to. Heat pumps must reach SEER2 16 and HSPF2 8 or higher. Furnaces must have an AFUE (Annual Fuel Utilization Efficiency) rating of at least 95%. These numbers matter because they define what the IRS will accept — a unit one point below the threshold does not may have access to, even if it is otherwise identical.

Key Takeaways

  • Only central air conditioners, heat pumps, and furnaces installed in your primary home in 2024 may have access to; window units and portable systems do not.
  • Your system must meet specific efficiency ratings: SEER2 16 for air conditioners, SEER2 16 and HSPF2 8 for heat pumps, and AFUE 95% for furnaces in most climate zones.
  • The installer or manufacturer must provide documentation of the efficiency rating and installation date, which you will need when you file taxes.
  • The credit amount is up to $2,000 per system type per year, but the total credit across all home improvements cannot exceed $3,200 in a single tax year.

How to verify your system meets the efficiency standard

Check the yellow EnergyGuide label on your equipment or the specification sheet from the manufacturer. The label lists the SEER2 rating for air conditioners and heat pumps, or the AFUE for furnaces. If you already have the system installed, the contractor should have left paperwork with these numbers. If you cannot find it, call the contractor or the manufacturer with your model number — they can confirm the rating in minutes.

Climate zone matters for some systems. The country is divided into regions, and furnaces in colder zones (zones 5 through 8) have a lower AFUE requirement of 90% instead of 95%. You can find your zone on the Department of Energy website by entering your ZIP code. If you are on the border between zones, confirm which one applies to your address before you buy.

What documentation you need to claim the credit

When you file your 2024 taxes, you will need to show the IRS that your system qualifies. Keep the manufacturer's specification sheet or the yellow EnergyGuide label showing the efficiency rating. You also need proof of installation — typically an invoice from the contractor dated in 2024, or a receipt showing the purchase and installation date.

Some manufacturers and installers now provide a certification form that states the system meets the tax credit requirements. If your contractor offers this, ask for it in writing. The IRS does not require you to attach these documents to your return, but you must have them available if the IRS asks questions later. Store them with your tax records for at least three years.

The credit amount and annual limits

The credit covers up to $2,000 per system type in a single year. If you install a heat pump and a furnace in 2024, you can claim up to $2,000 for each, for a total of $4,000 — but only if you have not already used the $3,200 annual cap on all home energy credits combined. The $3,200 limit applies across all may have access to improvements in one tax year, including insulation, windows, doors, and water heaters.

If you install multiple units of the same type — for example, two heat pumps — only one qualifies for the credit. You cannot claim the credit twice for the same system type in the same year, even if you have two units running. The credit is nonrefundable, meaning it reduces your tax bill but cannot result in a refund if the credit is larger than what you owe.

Systems installed before 2024 or after 2024

The tax credit applies only to systems installed between January 1 and December 31 of the tax year you claim it. If your contractor installed your system on December 31, 2023, you cannot claim it on your 2024 return — you would have claimed it on your 2023 return if you had not already. If installation happens on January 1, 2025, you claim it on your 2025 return.

The installation date is what matters, not the purchase date. You can buy a system in November 2024 and have it installed in January 2025, and the credit applies to 2025. Confirm the installation completion date with your contractor in writing before work begins, because this date determines which tax year you use.

Rental properties, second homes, and other restrictions

The credit is limited to your primary residence — the home where you live most of the year. If you own a rental property or a vacation home, systems installed there do not may have access to, even if they meet the efficiency requirements. The IRS defines primary residence as the place you occupy for more than half the year.

If you are married and file jointly, only one primary residence per household qualifies. If you own two homes and live in each for part of the year, you must designate one as your primary residence for tax purposes, and only that home's HVAC system qualifies for the credit.

What happens if your system does not quite meet the threshold

If your system has a SEER2 rating of 15 instead of 16, or an AFUE of 94% instead of 95%, it does not may have access to for the credit. The efficiency standards are fixed — there is no partial credit for systems that fall short. This is why checking the specification sheet before you buy matters. A contractor may not know the exact rating off the top of their head, so ask them to confirm it in writing before you sign a contract.

Some older systems or discontinued models may not have published SEER2 ratings because they were rated under an older standard (SEER). The IRS does not accept SEER ratings for the 2024 credit — the system must have a SEER2 rating. If your contractor cannot provide a SEER2 rating, the system likely does not may have access to.

Frequently Asked Questions

Can I claim the credit if I installed the system myself?

No. The system must be installed by a contractor or professional. The IRS requires that a may have access to installer perform the work. If you purchased the equipment and installed it yourself, you cannot claim the credit, even if the system meets the efficiency requirements.

What if I replaced only part of my HVAC system, like just the outdoor unit?

Replacing only the outdoor unit or only the indoor unit typically does not may have access to. The credit generally requires installation of a complete system — both the indoor and outdoor components. If you replaced only one part, check with the IRS or a tax professional, because the rules can vary depending on what was replaced and how the system is configured.

Do ductless mini-split heat pumps may have access to?

Ductless mini-split systems are heat pumps and can may have access to if they meet the SEER2 and HSPF2 requirements. However, the credit is limited to one heat pump per year, so if you install multiple mini-split units in the same year, only one qualifies for the credit.

Can I claim the credit if I bought the system in 2024 but had it installed in 2025?

Yes. The installation date is what determines which tax year you claim the credit on, not the purchase date. If the contractor completed the installation in 2025, you claim the credit on your 2025 return, even if you paid for it in 2024.

What if the contractor did not give me documentation of the efficiency rating?

Contact the contractor and ask for the manufacturer's specification sheet or a copy of the invoice that lists the model number. You can then look up the SEER2 or AFUE rating online using the model number, or call the manufacturer directly. Keep whatever documentation you gather with your tax records.