Georgia Drew a Line in 2011. Fourteen Years Later, They’re Still the Only State That Has.

The 💥

On January 1, 2011, the State of Georgia did something no other state in the country has done before or since: it wrote into its building code that grid-connected powered attic ventilators are not allowed in new homes. Not discouraged. Not “consult a professional.” Not allowed.¹²

The exact language, tucked into Section 403.10 of Georgia’s supplement to the 2009 International Energy Conservation Code, reads: “In new construction, power attic ventilators shall not be connected to the electric grid. Power attic ventilators connected to a solar panel are allowed.”

It was, in the polite world of state building codes, a bomb going off. An entire product category — sold by the millions at every Home Depot and Lowe’s in the country — was told, in effect: you don’t belong in our new homes. And 14 years later, not one other state has followed.

That’s the story worth telling. Not just “attic fans are bad” — we’ve been telling that story to our Gulf South clients for years. The bigger question is: why did Georgia break ranks, why hasn’t Louisiana, and what does it mean for the homes being built around us right now?

What Georgia actually did (and what it didn’t)

The PAV amendment didn’t arrive alone. It came as one line item in a much bigger 2011 code package — the one that also made Georgia the first state in the nation to require blower-door testing on every new home, plus mandatory duct-leakage testing and a ban on electric resistance heat as a primary heat source. The Department of Community Affairs Board approved the package on November 3, 2010 after 18 months of task-force work, and it took effect January 1, 2011.³⁴

The PAV line was almost a footnote in the announcement. But it stuck. It survived every code cycle since. The current 2015 IECC with 2020, 2022, and 2023 Georgia amendments still carries it, now with tightened language prohibiting connection to “the Service supply premise wiring system.”⁵

Three things Georgia did not do, though, are worth being clear about:

• New construction only. Every existing Georgia home with a PAV in the attic still has one. The code doesn’t reach retrofits.
• Solar was left in as a compromise. Grid-powered fans were the political target; the solar carve-out was the concession needed to get the ban through. GreenBuildingAdvisor titled its coverage “Georgia Pulls the Attic-Ventilator Plug (Sort of)” for a reason.⁶
• Retail was untouched. Home Depot and Lowe’s in Atlanta still sell grid-tied attic fans. Contractors still install them on existing roofs. The code touches new construction and stops there.

ENERGY STAR quietly agrees — in writing

Georgia isn’t operating on a hunch. It’s operating on the same research that led the U.S. EPA’s ENERGY STAR program to make a decision most homeowners never notice: powered attic ventilators are not just uncertified — they are explicitly excluded from certification.

Buried in ENERGY STAR’s Program Requirements for Residential Ventilating Fans, Version 4.2, the specification lists categories of products that are ineligible for the label. Second on that list, right under heat/energy recovery ventilators, is a single line: “Powered attic ventilators (e.g., gable fans).”⁷

This isn’t an oversight. It’s a written exclusion. And the Department of Energy’s Building America Solution Center — the federal government’s technical clearinghouse for residential building science — puts the two facts side by side in a single sentence: “They are not recommended by the ENERGY STAR program, and they are not allowed by the Georgia State Energy Code (unless solar powered).”⁸

ENERGY STAR’s consumer-facing attic-ventilation page is only slightly softer, warning that “if your attic has blocked soffit vents and is not well-sealed from the rest of the house, attic fans will suck cool conditioned air up out of the house and into the attic.”⁹ Which, in the real-world Gulf South housing stock, describes just about every attic we ever crawl into.

Pros and cons: what Georgia’s decision actually did

The wins

• Grid impact. Georgia removed an always-on summer-peak load from every new home built in the state since 2011. Stacked with mandatory blower-door and duct-leakage testing, the combined air-tightness gains dwarf the PAV kilowatts — but the PAV ban closed a documented leak pathway on the way in the door.
• Combustion safety. In new homes with atmospherically-vented gas appliances, the code eliminated a known back-drafting scenario at the code level, not case-by-case in the field. A 1994 ACEEE field study first documented that PAVs draw an average of 231 CFM of conditioned air from the house and depressurize the living space by 0.5 to 2.5 Pascals — enough to reverse combustion appliance draft in some configurations.¹⁰
• Signal to the industry. Georgia’s code is cited by DOE, PNNL, and the building-science press as the working example that a state code office can, in fact, look at the research and act on it. That’s a rarer thing than it should be.

The losses (or limits)

• The solar loophole. The physics of depressurization don’t care where the electricity comes from. A solar PAV moving 800 CFM creates the same pressure field as a grid PAV moving 800 CFM. Georgia’s own 2020 Field Guide, published by Southface, quietly notes that solar PAVs are permitted “but not recommended due to attic depressurization potentially pulling conditioned air from the house.”¹¹
• Retrofit gap. The millions of existing Georgia homes with PAVs installed before 2011 are unaffected. Homeowners and contractors are on their own to figure it out.
• Zero contagion. Fourteen years in, no other state has copied the amendment. Florida hasn’t. Texas hasn’t. Louisiana hasn’t. That’s partly politics, partly inertia, partly the reality that most state code processes move at glacial speed.

Who’s affected

• Homebuilders in Georgia. One fewer product to spec on new roofs. Not a hardship — most builders never loved PAVs anyway.
• PAV manufacturers. Lost a small but real chunk of one state’s new-construction market. Notably, none mounted a public fight against it — which itself tells you something.
• Georgia homeowners. New builds since 2011 have quietly avoided a fan they were never going to benefit from. Existing homes still have them.
• The rest of the Gulf South. Unaffected — which is exactly the point of this article.

Was there any public fight over it?

Honestly? Not much. That’s part of why the story is interesting.

There was no PAV manufacturer lawsuit. No home-builder-association floor fight. No governor’s desk showdown. The amendment moved through the State Codes Advisory Committee process, was approved by the DCA Board, and took effect — with the solar carve-out functioning as the release valve for whatever opposition existed. The building-science community (Energy Vanguard, GreenBuildingAdvisor, Building Science Corporation) cheered publicly.¹²

You can find grumbling on HVAC contractor forums — someone on HVAC-Talk noting dryly that “the solar powered ones did not go over well” — but no organized industry pushback ever materialized. Which suggests the underlying case against PAVs was, and is, stronger than the case for them.

Why Louisiana hasn’t followed — and why it matters

Louisiana operates on a modified version of the 2021 IRC and IECC, and our code says nothing about powered attic ventilators. They’re legal. They’re common. In my personal experience across a lot of New Orleans and Gulf South attics, nearly every contractor from every trade — roofers, HVAC installers, general contractors — either recommends them, installs them, or defends them.

That’s not because our climate is different from Georgia’s. Metro Atlanta and Baton Rouge share Climate Zone 3A most of the way; South Georgia and South Louisiana sit in 2A together. The physics are identical. The housing stock leaks the same way. The gas appliances back-draft the same way.

What’s different is code-office culture and the political will to look at inconvenient research. Georgia was the first state to make blower-door testing mandatory — the PAV ban rode in on the same wave of “actually measure what’s happening in these houses” thinking.¹³ Louisiana hasn’t made that leap yet.

The takeaway for a Gulf South homeowner

You don’t need to wait for Louisiana’s code to catch up to Georgia’s. The federal government (through ENERGY STAR and DOE’s Building America program), one entire state’s code office, and the building-science research consensus are already in agreement: the powered attic ventilator, grid or solar, is a solution to the wrong problem.

If you already have one, disconnecting it costs nothing. If a contractor is about to install one on your new roof, ask them for the pressure math and the make-up air path before you sign. If they don’t know what those words mean, that’s your answer.

Georgia figured this out in 2011. Fourteen years on, we still have time to catch up — one house at a time, if not one code cycle at a time.

Want the physics?

This piece is the why-Georgia-did-it story. For the why-the-physics-actually-work-that-way story — attic heat transfer, the neutral pressure plane, the BPI worst-case depressurization protocol, and the six-tier hierarchy of what to actually do instead — see our companion piece: Powered Attic Ventilators: The Physics Behind the Ban.

If you’re in the New Orleans area and think you might have a PAV working against you, call Diversified Energy at 504-273-7779. The Subtractive Fix — improving a house by removing something, not adding something — is often the cheapest, fastest win in a home performance plan. Georgia figured that out in a code amendment. We’ve figured it out one attic at a time.

References

1. Georgia Department of Community Affairs, Codes Update Newsletter — Winter 2010. Link
2. Georgia State Minimum Standard Energy Code, IECC (2009) §403.10 — UpCodes. Link
3. Georgia DCA, “New Georgia Energy Code to Take Effect on January 1, 2011,” Codes Update Newsletter, Winter 2010. Link
4. Allison Bailes, “The Struggle to Update Georgia’s Energy Code,” Energy Vanguard. Link
5. Ga. Comp. R. & Regs. R. 110-11-1-.34, “IECC 2015 Edition with 2020, 2022, and 2023 Georgia State Amendments.” Link
6. GreenBuildingAdvisor, “Georgia Pulls the Attic-Ventilator Plug (Sort of).” Link
7. ENERGY STAR Program Requirements for Residential Ventilating Fans, Version 4.2, Section II.B (“Excluded Products”), U.S. EPA. Link
8. U.S. DOE Building America Solution Center, “Attic Ventilation Fans,” Pacific Northwest National Laboratory. Link
9. ENERGY STAR, “About Attic Ventilation,” U.S. EPA. Link
10. Cummings, Tooley & Moyer, “Unplanned Impacts On Houses By Powered Attic Ventilators,” ACEEE Summer Study on Energy Efficiency in Buildings (1994). Link
11. Southface Institute, “Georgia Residential Energy Code Field Guide (2020).” Link
12. Allison Bailes, “Power Attic Ventilators Banned by New Georgia Energy Code,” Energy Vanguard (Aug. 15, 2011). Link
13. Allison Bailes, “Georgia Energy Code Pushes the Envelope…Literally,” Energy Vanguard (2010). Link