The exemption that let outdoor residential HVAC equipment skip GFCI protection expired Sept. 1, bringing updated requirements for contractors to keep in mind for upcoming installations. AHRI and ACCA pushed hard for a two-year extension, but as of this writing the exemption in NEC 210.8(F) has lapsed on schedule, and every outdoor condenser or heat pump install now falls under a code requirement that the industry itself has flagged as unresolved.
What Just Changed
NEC 210.8(F) requires GFCI protection for outdoor outlets rated 150 volts or less to ground and 60 amps or less, which covers the vast majority of residential outdoor condensing units and heat pumps. A temporary exemption for listed outdoor HVAC equipment has shielded contractors from this requirement while the industry worked out compatibility problems between GFCI devices and HVAC equipment. That exemption was always scheduled to expire Sept. 1, 2026, and it has.
AHRI filed a Tentative Interim Amendment asking NFPA to extend the exemption to 2028, citing its own 112-page Phase II testing report documenting continued nuisance tripping. NFPA is accepting public comment on that request through Sept. 9. Unless and until it passes, the exemption is gone, and code officials in jurisdictions that have adopted the current NEC cycle can enforce GFCI protection on new outdoor HVAC installs starting now.
Why GFCIs and HVAC Equipment Do Not Always Get Along
The core problem is not limited to one equipment type. An NFPA task group first flagged this in 2022, and it explicitly found nuisance-tripping involving both inverter-driven variable-speed systems and conventional single-stage equipment. More recent AHRI testing reinforces the concern for standard 60 Hz single-stage systems specifically, not just the newer inverter-driven units most contractors assumed were the whole problem.
| Equipment Type | Assumed Risk Level | What Testing Actually Found |
| Variable-speed / inverter-driven | High — widely assumed to be the main issue | Confirmed nuisance tripping, especially during startup and compressor ramp-up |
| Conventional single-stage | Low — often assumed unaffected | 5 of 12 GFCIs tested tripped below the applicable must-hold current above 60 Hz |
| Cord-connected condensate pumps | Not commonly considered at all | ACCA specifically flagged these for a separate exemption request |
The Stakes Go Beyond a Callback
Nuisance tripping is an inconvenience for most homeowners, but the 2022 task group weighed something more serious: the risk of losing cooling entirely during extreme heat, especially for occupants who cannot easily diagnose a tripped GFCI or arrange same-day repair. Maricopa County recorded 138 indoor heat-related deaths in 2024. Air conditioning was present in 88% of those cases, and the equipment was either not functioning or not in use in the large majority of them. A nuisance trip during a heat wave is not a minor annoyance for an aging-in-place or medically vulnerable occupant who cannot reset a breaker.
What to Do on the Next Install
- Check which NEC edition the local jurisdiction currently enforces, since not every jurisdiction adopts a new cycle immediately, and some may not have picked up the version requiring 210.8(F) compliance yet.
- Confirm with the local code official whether the Sept. 1 exemption expiration is being actively enforced in that jurisdiction, since enforcement timing can lag adoption.
- If GFCI protection is required, specify a high-frequency GFCI device where available, since standard Class A GFCIs are more likely to nuisance-trip on HVAC leakage current.
- Document the specific GFCI model installed on every job, since availability and compatibility both vary by manufacturer and product line right now.
- Set expectations with the customer up front that a nuisance trip is a known industry issue, not necessarily a sign of a bad installation, and walk through how to reset the device safely.
- Watch the NFPA public comment period on TIA 1924, open through Sept. 9, since a successful extension would roll the requirement back to 2028 in jurisdictions that follow it.
Products That Make Compliance Easier
A disconnect with a built-in GFCI receptacle solves two code requirements in one part number. The MARS A/C disconnect pairs a 60-amp non-fused disconnect with a pre-wired GFCI receptacle in one enclosure, which satisfies both the visible disconnect requirement most jurisdictions already enforce and the GFCI outlet requirement now back in effect.
For techs stocking a truck with both styles, the A/C Disconnects category covers fused, non-fused, and GFCI-integrated disconnects side by side, and the standalone GFCI Receptacles category covers weather-resistant models for jobs where the disconnect and receptacle install as separate components.
ACCA’s filing also specifically flagged cord-connected condensate pumps in basements as a nuisance-trip risk distinct from outdoor equipment. Techs replacing a pump on a GFCI-protected circuit should confirm the pump’s compatibility rather than assuming any model in the condensate pump category performs identically on that type of circuit.
Frequently Asked Questions
Does the GFCI exemption expiring mean every outdoor AC unit now needs a GFCI retrofit?
It applies to new installations under NEC 210.8(F) in jurisdictions that have adopted the code cycle containing that requirement. Existing installations are generally not required to be retrofitted unless local code specifically mandates it or other work triggers an upgrade requirement.
Is this GFCI issue limited to variable-speed HVAC equipment?
No. AHRI testing found that five of twelve GFCIs tested tripped below the applicable must-hold current on conventional 60 Hz single-stage equipment, not just inverter-driven variable-speed systems. This is an important distinction since many assumed single-stage equipment was unaffected.
What is a high-frequency GFCI, and does it fully solve the nuisance-tripping problem?
A high-frequency GFCI is designed to avoid tripping on the higher-frequency leakage current that HVAC equipment can generate during normal operation. Availability represents progress but does not by itself demonstrate compatibility across the full range of listed HVAC equipment, according to industry testing.
What happens if NFPA approves the TIA extension request?
If TIA 1924 passes, the exemption for listed outdoor HVAC equipment would extend to Sept. 1, 2028, giving the industry more time to resolve compatibility issues. Jurisdictions would need to adopt or recognize the TIA for it to apply locally.
Can a homeowner just reset a tripped GFCI themselves?
Often yes, if the device is accessible and the homeowner knows how to locate and reset it. The concern raised by industry groups is specifically about occupants who are aging in place, convalescing, or otherwise unable to recognize or respond to a loss of cooling before it becomes dangerous.
Are cord-connected condensate pumps affected by this same GFCI issue?
ACCA specifically requested an exemption for cord-connected condensate pumps in basements, separate from the outdoor equipment exemption, citing similar nuisance-tripping concerns. That request is part of the same ongoing industry conversation but addresses a different equipment category.
Does this requirement apply to commercial HVAC installations the same way?
NEC 210.8(F) is generally focused on outdoor outlets at the amperage and voltage levels common to residential equipment. Commercial installations often involve different voltage and equipment configurations that may fall outside or alongside this specific rule, so jurisdiction-specific guidance matters more on commercial work.
How can a contractor find out if their local jurisdiction is actively enforcing this right now?
Contacting the local code official or building department directly is the most reliable way to confirm both which NEC edition is adopted and whether enforcement of 210.8(F) for outdoor HVAC equipment is active as of a specific date.
Is there a way to test GFCI and equipment compatibility before a full install?
Some contractors are running startup verification with the specific GFCI device installed before considering a job complete, checking for trips during compressor startup and ramp-up specifically, since that is when AHRI’s testing found the highest likelihood of nuisance tripping.
Where can a contractor read the actual AHRI testing data referenced in this debate?
AHRI’s Phase II report on GFCI and HVAC equipment compatibility is publicly available through AHRI’s website, and it is the primary technical document cited by both AHRI and ACCA in their extension request to NFPA.
Current Events
This is a genuinely unresolved industry problem, not a case of contractors just needing to catch up on code. AHRI’s own testing shows GFCI devices tripping on equipment that is operating exactly as designed. Until a TIA passes or the technology catches up, the safest move is to know the local enforcement timeline, document the GFCI model on every job, and set the customer’s expectations before the first nuisance trip becomes a surprise call back.
