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HVAC by state: the local rules that change the answer

Efficiency minimums, license classes and fuel prices vary by state, and each can change what you should buy.

Updated September 2026 · Data as of each state page’s own dated sources, compiled September 16, 2026

Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking

8 states covered in depth Each built on a local rule, not a template
Regional federal efficiency minimums Not national, and Texas sits on a region boundary
Varies what a license permits Georgia caps system size by license class

The short answer

Three things that decide an HVAC choice are local. Federal efficiency minimums are regional, so what may be installed differs by state. Licensing differs, and in Georgia the license class caps system size.

Fuel prices set the running cost, the larger half of a fifteen-year bill in most of the country. Each state page below is built on the rule that changes the answer there.

Which states are covered?

Eight, so far. Each card names the thing that makes that state different. If these could be swapped between states without becoming wrong, they would be doorway pages — and they cannot be.

TX Region boundary HVAC in Texas Texas is in the Southeast efficiency region right up to the New Mexico line, so El Paso follows a different federal rule from the desert next door. For a home, the license endorsement matters more than the class. Read the state page FL Installation rule HVAC in Florida The Southeast installation rule governs what can be installed rather than only what can be built, which is a distinction most national pages miss entirely. Florida also licenses air conditioning contracting statewide. Read the state page CA Title 24 HVAC in California EER2 rather than SEER2 is the binding metric in the hot-dry region, Title 24 adds requirements on top of the federal floor, and California’s electricity prices move the running-cost half of the decision more than almost anywhere else. Read the state page AZ Efficiency rule HVAC in Arizona The Southwest regional standard sets a higher bar than the national minimum, and in a climate where cooling dominates the annual bill the gap between a compliant unit and a good one is money rather than paperwork. Read the state page GA License ceiling HVAC in Georgia Georgia’s conditioned air license comes in classes with a capacity ceiling, so the license class of the company quoting you determines the size of system they may lawfully install. It is the clearest example on the site of a license rule that changes a homeowner’s shortlist. Read the state page OH Fuel prices HVAC in Ohio Cheap natural gas against above-average electricity sets a breakeven COP that a typical heat pump misses, and the page says so. The answer depends on the specific machine, not a national rule of thumb. Read the state page WA Code change HVAC in Washington Washington’s adopted code contained heat pump mandates that were removed before it took effect. A page that still describes them is wrong today, which is why local pages need re-checking rather than writing once. Read the state page NC License groups HVAC in North Carolina The state licenses heating work in numbered groups rather than as one trade, so "licensed" is an incomplete answer here — the group determines what the company may work on. Climate splits the state as well, from the coast to the mountains. Read the state page

What actually varies from state to state?

Efficiency rules, licensing, fuel prices and codes. Plenty of local pages vary the weather and nothing else. These are the variables that change what you should buy and who may install it.

Federal efficiency minimums are regional
The national minimum is a floor, and the North, Southeast and Southwest carry different requirements above it. In the Southeast and Southwest the rule governs installation rather than only manufacture, which is a stronger constraint.
The regions are lists of states, so the line follows state borders: El Paso, Texas, and the desert over the New Mexico line follow different rules.
Licensing differs, and sometimes caps what you can buy
HVAC is licensed statewide far more consistently than most trades, because refrigerant and combustion attract regulation. But the classes differ: North Carolina licenses heating in numbered groups, and Georgia’s conditioned air classes carry a capacity ceiling — so the license class of the company quoting you can determine the size of system they may install.
Fuel prices decide the larger half of the bill
Running cost is the larger half of fifteen-year cost in most US jurisdictions, and it is set by your state’s electricity and gas prices. This is why the heat pump answer is genuinely different in Ohio than in California, and why a national payback figure is close to useless.
Codes change, and stale pages become wrong rather than dated
Washington’s adopted code contained heat pump requirements that were removed before it took effect. A page written before that change does not become merely old; it becomes wrong. That is why these pages carry retrieval dates.

Why are there no city pages?

Because most would repeat the state page with a new name. The obvious next move for a site like this one is a page for every metro, and it is the move that turns a useful archive into a doorway network.

A city page earns its place when there is something genuinely local to say: a permit fee, a municipal licensing requirement on top of the state’s, a design temperature that changes the specification, a utility program that exists there and not thirty miles away. Where that exists, the page is worth writing.

Where it does not, the page becomes the state page with a city name substituted — and this site’s standing rule is that such a page must not ship.

HyreHVAC position: we would rather publish eight state pages somebody can rely on than four hundred city pages that say the same thing in different fonts. City pages will appear where a specific local fact justifies one, and not to fill a grid.

Do these pages list HVAC companies?

No. The state pages are guides to the rules, not directories of companies. No page here publishes a count of contractors, a ranking or a recommendation of any firm.

That is deliberate. License registers return what they return on the day they are queried, which is a snapshot rather than a census of the trade, and being licensed is a floor rather than a verdict on anybody’s work.

What we check and what we deliberately do not is set out on how we vet.

Forty-two states have no page here yet. Their absence is not a judgment about them; the eight published are the ones where the research has been done.

Questions

Why does HVAC advice change so much by state?
Because three variables that decide it are set locally. Federal efficiency minimums are regional, and in the Southeast and Southwest they govern installation. Licensing differs, and in some states the class limits system size. Fuel prices set the running cost, the larger half of a fifteen-year bill in most of the country.
Does the federal efficiency minimum apply everywhere?
Yes, as a floor, and two regions carry higher requirements above it. The Southeast and Southwest rules are also stronger in kind, because they restrict what may be installed rather than only what may be manufactured. The regions follow state lines, which is why El Paso and neighboring New Mexico differ.
Is a heat pump the right choice in my state?
Not always. The answer turns on the ratio between your local electricity and gas prices. In Ohio and California, average prices favor the gas furnace on running cost; in most of the other states covered here, the heat pump wins. The price ratio study covers every state.
Why are there no city pages?
Because a city page is only worth writing when something specific to that city changes the advice: a permit fee, a municipal license requirement, a design temperature, a local utility program. Without one, it is the state page with a city name swapped in, which this site does not publish.
Do you list HVAC companies by state?
No. These pages cover the rules, not firms. We publish no contractor counts, rankings or recommendations, because a license register is a snapshot rather than a census, and being licensed is a floor, not a verdict on the work. See how we vet.
My state is not listed. What should I do?
Start with the national guides, which cover everything that does not vary: how the equipment works, how to read a quote, what to ask a contractor. Then check your state licensing board for what a license permits, and your utility for any open program, since federal credits have closed.

Written and audited by

HYRE HVAC Research Desk

Primary-source research, data analysis and fact checking

We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.

Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify.

The counts below are generated from the published pages themselves, last counted September 28, 2026, and they are what we have actually published rather than what we intend to.

13
studies published
12
federal sources read and cited
8
studies published with their full dataset as CSV
51
jurisdictions reproduced against EIA’s own tables

How this desk works

  • Primary sources only. Federal data comes from the agency that collects it, in the file that agency publishes. We do not cite an article that cites a source; we download the source and compute the figure ourselves.
  • We validate against the agency before we publish. First, we use each federal microdata file to reproduce the agency’s own published tables. Our cooling research reproduces EIA’s state estimates and standard errors for all 51 jurisdictions. That check caught a variance formula that was off by a factor of four.
  • Every estimate carries its uncertainty. These are survey figures, not counts. Standard errors are computed from the replicate weights the federal file supplies and printed beside the estimate. An estimate too imprecise to publish is reported as such rather than printed.
  • Nothing is typed by hand. Prose, tables and charts all read from one dataset built by script, so a number in a sentence and the same number in the table below it cannot disagree.
  • We publish the data, not just the conclusion. 8 of our 13 studies offer the full computed table as a CSV download on the page, so you can check the analysis or disagree with it. A study without a row-level dataset gets no download link and claims none in its structured data.
  • We correct in public. Where we have published a figure wrongly we fix the figure, rewrite any analysis that rested on it rather than patching the number underneath it, and leave a dated correction note on the page.
  • We do not install or sell HVAC equipment, and we take no payment for placement, ranking or a favorable mention. Nobody buys a position on this site.

Data as of each state page’s own dated sources, compiled September 16, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.

Sources & retrieval dates

HyreHVAC — Regional SEER2 minimums , The regional structure of the federal efficiency standards, including which regions restrict installation rather than only manufacture. Carries its own primary sources and retrieval dates. Retrieved September 16, 2026.
HyreHVAC — HVAC licensing by state , How the states covered here license the trade, including the class structures referred to on this page. Retrieved September 16, 2026.
HyreHVAC — Electricity versus gas price ratio , The running-cost variable, state by state, from EIA’s own price series. The reason the heat pump answer differs between Ohio and California. Retrieved September 16, 2026.

Related research

About HyreHVAC What this site is, what it is not, and how it earns Read this next The regional SEER2 split Why the efficiency minimum where you live is not the national one Read this next HVAC licensing by state What a license permits, and why that differs so much Read this next Electricity versus gas prices The ratio that decides the running-cost half of the bill Read this next How we vet HVAC professionals What we check against public registers, and what we do not Read this next HVAC cost questions What decides a bill, and how to judge the quote you were handed Read this next

The rules are local. So is the contractor.

If you know which state you are in and what the system is, we can take it from there. Tell us the equipment, the problem and the zip code, and we will follow up. Submitting an inquiry is not a service call.

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HyreHVAC is a research and referral site. We do not perform HVAC work and we do not rank or recommend companies. These pages describe rules and conditions that vary by state; they are not legal or code determinations for your project, and local jurisdictions may impose requirements above the state’s.