Short answer: On September 1, 2026, a National Electrical Code exception that let outdoor air conditioners and heat pumps skip ground-fault (GFCI) protection expired. An NFPA code panel rejected a request to extend it to 2028, and HVAC industry groups have appealed. Whether the rule affects your next AC or heat pump install depends on the code your state and city enforce. Texas, for example, kept the exemption in place.

What is the outdoor HVAC GFCI rule?

Section 210.8(F) of the National Electrical Code (NEC), first added in the 2020 edition, requires GFCI protection for outdoor outlets at homes. Because the NEC defines "outlet" broadly, the rule covers hard-wired equipment like air conditioner condensers and heat pumps, not just plug-in receptacles, as the National Association of Home Builders explains.

A GFCI cuts power when it senses current leaking where it shouldn't, which helps prevent shocks. The problem is that many modern HVAC systems use variable-speed compressors and inverter electronics. Those systems can make standard GFCI breakers trip when nothing is wrong, which the industry calls "nuisance tripping." When that happens, the AC simply shuts off until someone resets the breaker.

To give manufacturers time to solve the compatibility problem, the NEC added an exception: "GFCI protection shall not be required for listed HVAC equipment." That exception carried an expiration date of September 1, 2026.

What happened in September 2026?

  • September 1: The exception expired on schedule.
  • August–September 9: The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) asked NFPA, through Tentative Interim Amendment 1924, to push the expiration to September 1, 2028. Public comments closed September 9.
  • September 18: The NEC code-making panel rejected the extension. According to ACCA, the technical vote was tied 10-10, which fell short of the threshold needed to pass.
  • Late September: ACCA and AHRI both appealed to the NFPA Standards Council. Homepros News reported that the Council's next meeting is scheduled for December 15.

While the appeals are pending, the requirement applies in places that enforce it without a local exemption. ACCA has said its appeal does not oppose GFCI protection itself, but that more testing is needed to confirm reliable compatibility with HVAC equipment.

Does this affect my home?

It depends on where you live. Electrical codes are adopted and enforced by states and local governments, not by NFPA directly:

  • States still on the 2017 NEC or earlier never had 210.8(F), so they aren't affected.
  • Some states and cities have modified, delayed or deleted the requirement. NAHB counts at least 19 states that have amended, delayed or limited it.
  • Texas extended the exemption with no expiration date. The Texas Department of Licensing and Regulation adopted the 2026 NEC as the state electrical code effective September 1, 2026, and the adopted rule keeps the HVAC exception in place. The state said the risk of widespread AC outages from nuisance tripping outweighs the benefits for now. Texas law also lets cities adopt local amendments, and work inside city limits must follow local ordinances, so check with your city's permit office.

If you're in an area that now enforces the rule, it mainly affects new installations and replacements. Existing systems are generally not required to be retrofitted unless local code calls for it or other work triggers an upgrade, according to guidance from SupplyHouse. Your local building department has the final word.

What should homeowners do?

If you're planning an AC or heat pump replacement:

  1. Ask your contractor which code edition your city enforces and whether 210.8(F) applies to your job.
  2. Ask what GFCI device they'll use. Newer high-frequency GFCIs are designed to work better with modern electronics, and the 2026 NEC also allows a special-purpose (Class C) GFCI option for qualifying HVAC equipment. Availability varies.
  3. Make sure the work is permitted and done by licensed pros. Many jobs involve both an HVAC contractor and an electrician.
  4. Learn where the breaker is. In much of the South, the electrical panel is outside the house. Know how to find and reset the GFCI.

If your outdoor unit stops running and you find a tripped GFCI, you can reset it once. If it trips again, don't keep resetting it and never bypass it. Call a licensed HVAC contractor or electrician to find out whether it's a compatibility issue or a real fault. Heat waves are when a surprise shutdown matters most, so it's worth sorting out before summer.

Looking for help? Browse locally owned HVAC companies and electricians on Service Pro Spotlight, including pros in Texas. If your system is due for a checkup, see our guide on how often to service your AC.

Frequently asked questions

Do I need to add a GFCI to my existing air conditioner?

Generally no. The rule applies to new installations where it is enforced. Existing systems usually don't need to be retrofitted unless your local code requires it or other electrical work triggers an upgrade. Check with your local building department.

Why does my AC keep tripping the GFCI breaker?

Modern variable-speed and inverter-driven HVAC equipment can trip some GFCIs even when there's no dangerous fault. It can also mean a real wiring or equipment problem. Have a licensed HVAC contractor or electrician diagnose it rather than resetting it over and over.

Does the GFCI rule apply in Texas?

Not for listed HVAC equipment under the state code. Texas adopted the 2026 NEC effective September 1, 2026, and extended the HVAC exception with no expiration date. Cities can adopt local amendments, so confirm with your local permit office.

Could the exception come back nationally?

Possibly. ACCA and AHRI have appealed the rejection to the NFPA Standards Council, which is scheduled to meet December 15. Until there's a decision, the requirement applies wherever it's adopted and enforced without a local exemption.