Central AC System GuideA federal tax credit has helped homeowners offset the cost of a high-efficiency central air conditioner. The credit rewards equipment that meets specific efficiency thresholds and comes with annual dollar caps. Because tax law changes, the figures below reflect ENERGY STAR guidance current at the time of writing and should be reconfirmed before relying on them for a purchase in a later tax year.
The credit amount
The credit is a share of the project cost with a ceiling. ENERGY STAR describes a credit of 30 percent of the project cost for a qualifying central air conditioner, up to a maximum of 600 dollars.
The credit reduces the tax owed rather than the equipment price at the register, so a homeowner claims it when filing for the year the system is installed.
Efficiency requirements
Only high-efficiency equipment qualifies. ENERGY STAR states that split system central air conditioners must meet SEER2 of at least 17.0 and EER2 of at least 12.0 to be eligible.
Packaged systems face a slightly different bar. ENERGY STAR states that packaged central air conditioners must meet SEER2 of at least 16.0 and EER2 of at least 11.5, so the equipment type determines the threshold.
Annual limits and how it fits together
The credit sits inside a larger annual cap. ENERGY STAR describes an overall yearly limit of 3,200 dollars for the Energy Efficient Home Improvement Credit, with central air conditioners counted under a 1,200 dollar combined cap alongside items such as furnaces, boilers, and building envelope improvements.
That structure means a homeowner planning several upgrades in one year should tally the caps together, since the central air conditioner shares its limit with other equipment.
Dates and the caveat to verify
The eligibility window is specific. ENERGY STAR states that the credit applies to products purchased and installed between January 1, 2023, and December 31, 2025.
This is the point to reconfirm. Because the published window ends December 31, 2025, any purchase after that date needs a fresh check of current IRS and ENERGY STAR guidance before a homeowner counts on the credit. Treat the figures here as accurate for the stated window and verify anew for later years.