A2L Training Requirements by State (2026)

Roughly 80% of new residential HVAC equipment shipped in 2026 runs on an A2L refrigerant — R-454B, R-32, or one of the related blends replacing R-410A. That equipment is in your customers' homes, and the question of whether you legally need documented A2L training to touch it depends almost entirely on which state you're standing in.

The answer isn't uniform. Fourteen states plus Washington D.C. have written A2L training requirements into law, backed by ASHRAE 15.2 provisions adopted into their mechanical codes. The rest haven't — yet. But even in states with no statutory mandate, every major OEM has tied warranty coverage to documented training. Carrier doesn't care that Texas hasn't codified ASHRAE 15.2. Their warranty terms do. Read our full A2L refrigerant transition guide for background on refrigerant properties, tool requirements, and the federal AIM Act timeline — this article focuses specifically on what each state requires.

This guide breaks down A2L training requirements state by state as of mid-2026: which states are mandatory, what code they're enforcing, when it took effect, and what the OEM warranty picture looks like regardless of where you work. For the full interactive lookup, use the A2L Transition Center on HVACJobs.IO.

The mechanism in most mandatory states is the adoption of ASHRAE 15.2-2022 — the standard written specifically for A2L refrigerants in residential and light commercial applications — either directly or through the 2021 International Mechanical Code (IMC). When a jurisdiction adopts these provisions, technicians working on A2L systems must demonstrate competency in A2L safety procedures, which in practice means completed, documented training from an accepted provider.

Mandatory States: The Full Breakdown

The following states had statutory A2L training requirements in effect as of mid-2026. Requirements derive from adoption of 2021 IMC provisions, state-specific mechanical code updates, or dedicated A2L regulatory action.

California

Code authority: California Mechanical Code + Cal/OSHA Title 8
Effective: January 1, 2024
What's required: Documented A2L safety training for work on A2L equipment. California moved through CARB's refrigerant regulations and parallel Cal/OSHA updates, creating a multi-agency compliance framework. The California Mechanical Code now references ASHRAE 15-2022 and 15.2-2022 directly. For current Cal/OSHA guidance, check the Division of Occupational Safety and Health's refrigerant handling publications.

Colorado

Code authority: 2021 International Mechanical Code — Colorado adoption
Effective: July 1, 2023
What's required: Documented A2L safety training before servicing A2L systems. Colorado was among the earlier IMC adopters, which pulled in ASHRAE 15.2 provisions as part of that update cycle. Verify current requirements with the Colorado Division of Housing.

Connecticut

Code authority: Connecticut State Building Code
Effective: January 1, 2024
What's required: Documented A2L safety training under state mechanical code updates aligned with ASHRAE 15.2. Connecticut's building code office handles enforcement; check with the Department of Administrative Services for compliance verification.

Washington D.C.

Code authority: DC Construction Codes
Effective: October 1, 2023
What's required: DC adopted the 2021 IMC and requires documented A2L safety training for technicians servicing A2L equipment. DC's Department of Buildings is the relevant AHJ.

Maine

Code authority: Maine Uniform Building and Energy Code
Effective: January 1, 2024
What's required: Maine's MUBEC adoption included 2021 IMC provisions covering A2L safety training requirements. Documented training is required for permitted A2L work. The Maine Department of Public Safety handles code enforcement.

Maryland

Code authority: Maryland Building Performance Standards
Effective: January 1, 2024
What's required: State mechanical code updates require documented A2L safety training for technicians servicing both residential and commercial A2L equipment. The Maryland Department of Labor covers HVAC contractor licensing verification.

Massachusetts

Code authority: Massachusetts Board of State Examiners / 248 CMR
Effective: July 1, 2023
What's required: Massachusetts incorporated A2L safety into licensing requirements through the Board of State Examiners of Plumbers and Gas Fitters. This is enforced through the licensing board rather than just the building code — meaning A2L safety competency is a condition of active licensure, not only of individual permits. Verify with the Office of Public Safety and Inspections.

New Hampshire

Code authority: NH State Fire Marshal / RSA 153
Effective: January 1, 2024
What's required: New Hampshire adopted A2L training requirements through state mechanical code updates, enforced through the State Fire Marshal's office. Check with the NH Division of Fire Safety for current verification procedures.

New Jersey

Code authority: NJ Uniform Construction Code
Effective: October 1, 2023
What's required: The NJ UCC requires documented A2L safety training for all technicians servicing A2L refrigerant systems. Compliance is verified through the Department of Community Affairs, which oversees contractor licensing and permitting.

New York

Code authority: New York State Mechanical Code 2020
Effective: July 1, 2023
What's required: Documented A2L safety training before servicing A2L systems. NYC has additional local requirements on top of the state code — if you're working in the five boroughs, confirm requirements with the NYC Department of Buildings separately from state code.

Oregon

Code authority: Oregon Mechanical Specialty Code (OMSC)
Effective: January 1, 2023
What's required: Oregon was among the first states to implement A2L training requirements. The OMSC update was adopted with A2L provisions, and both Oregon CCB (Construction Contractors Board) and BOLI (Bureau of Labor and Industries) require documented training for licensed technicians. Oregon's early adoption makes this one of the more mature compliance environments in the country.

Rhode Island

Code authority: Rhode Island State Building Code
Effective: January 1, 2024
What's required: Rhode Island requires documented A2L safety training under state code updates. Rhode Island's small geography and tight enforcement culture — it has one of the higher inspection-to-contractor ratios in New England — means compliance gaps surface quickly. Verify with the State Building Code Commission.

Vermont

Code authority: Vermont Fire and Building Safety Code
Effective: January 1, 2024
What's required: Vermont requires documented A2L safety training under state mechanical code and Department of Labor requirements. The Division of Fire Safety handles enforcement.

Washington State

Code authority: Washington State Mechanical Code / L&I WAC 296
Effective: July 1, 2023
What's required: Washington L&I and the Washington State Mechanical Code together require documented safety training for all technicians handling A2L refrigerants. L&I enforcement through WAC 296 means this touches contractor licensing directly — not just permitting. Check the Department of Labor & Industries for current training documentation requirements.

States Where It's Not Mandatory — But Still Effectively Required

The remaining states fall into the "recommended" tier: no statutory mandate as of mid-2026, but OEM warranty requirements create an identical practical outcome for any tech doing new-equipment work.

This group includes large HVAC markets: Florida, Texas, Arizona, Georgia, North Carolina, Ohio, Michigan, Pennsylvania. None have adopted statewide A2L training mandates as of this writing.

A few things to understand about this category:

Local AHJs can move independently of state code. Cities and counties can adopt current mechanical codes even when the state hasn't. Chicago operates under local codes that often exceed Illinois state requirements. Philadelphia and Pittsburgh may have stricter requirements than Pennsylvania's statewide code. In any of these states, check with the local building department — not just the state — before assuming no requirement applies.

Illinois is a specific example. The state itself has no mandate, but Chicago and Cook County have history of adopting current IMC editions independently. If you're working in Chicagoland, treat it like a mandatory state until you've confirmed the local AHJ's current position.

The OEM requirement doesn't have a geographic exception. Carrier's warranty terms for Puron Advance equipment require documented A2L training from the technician performing the installation or service. Those terms don't change based on whether your state has codified the requirement. Florida is the second-largest HVAC market in the country. The volume of new A2L installations there means warranty work without documented training is a significant financial exposure.

For a current, state-by-state view of what applies where you work, use the HVACJobs.IO A2L Transition Center — it's updated as states adopt new code editions and the AHJ landscape evolves.

The OEM Warranty Angle

Every major residential HVAC manufacturer requires documented A2L training as a warranty condition. This is not a suggestion. These are written warranty terms.

Carrier (including Bryant): A2L Safety & Handling Certification required for warranty coverage on all Puron Advance (R-454B) equipment. Claims can be denied if the installing or servicing tech can't provide documentation.
Daikin (including Goodman and Amana): A2L Refrigerant Safety Training required for warranty coverage on R-32 and R-454B equipment. Service records must reflect trained technician credentials.
Lennox: A2L Safety Module through Lennox Learning Solutions required. Claims may be denied without proof of training.
Trane (including American Standard): A2L Certification required for all warranty work on R-454B products.
Rheem: Documented A2L training required for warranty eligibility on all A2L-rated equipment.
Mitsubishi Electric: Diamond Contractor program requires A2L training. Non-trained installers void the Diamond warranty on R-32 mini-splits.
York/JCI, Bosch: Both require documented A2L safety training for warranty service.

Across these brands, you're looking at the overwhelming majority of new residential equipment. The practical floor for any shop doing new installs or warranty service is: every tech needs documented training.

The qualification of "documented" matters. Having taken a course is not the same as being able to produce documentation. Keep certificates somewhere accessible — a training log in your service software, PDFs in employee files, or a shared folder your service manager can pull from. Warranty claim reviews happen after the fact, sometimes months later.

What Happens Without It

The consequences operate at three levels, and they compound.

Failed inspections. In mandatory states, an A2L system installed or serviced by a tech who cannot produce training documentation can fail a mechanical inspection. That means a callback, rescheduled inspection, and the labor cost of a second trip — plus the potential for a permit hold that delays customer completion or CO in new construction. On a commercial project, a mechanical hold can cascade into delays across other trades.

Voided warranties. In any state where the equipment is under OEM warranty, undocumented A2L service creates a warranty gap. If that system has a compressor failure six months later and the manufacturer reviews service records, the claim can be denied. You're now explaining to the customer why the warranty doesn't cover their compressor replacement — or you're eating the cost.

Employer liability exposure. When a technician without A2L training causes an incident during service — even a minor refrigerant release that leads to an ignition event — the employer's exposure is significantly higher if the tech lacked the training that was either legally required or contractually required by the OEM. The lack of documented training functions as evidence of inadequate training practices. Workers' comp and general liability insurers are paying attention to this; some are beginning to ask about A2L training compliance in contractor policy renewals.

None of this is hypothetical. The first warranty denial cases involving A2L training documentation gaps started appearing in trade publications in late 2025. The pattern is consistent: shop does a new install, tech is competent and the work is correct, but there's no training documentation. Compressor fails under normal use. Manufacturer reviews the claim and asks for tech training records. No records. Claim denied.

How to Verify Your Compliance Status

If you're in a mandatory state and you're not certain your techs are covered, the verification process is straightforward.

Start with the source document your state references. For most mandatory states, this is either the adopted IMC edition (available through ICC) or the specific state mechanical code. The requirement language will specify what "documented training" means in that jurisdiction — usually a certificate of completion from an accredited provider.

Accepted providers vary by state, but most jurisdictions accept training from ESCO Group, HVAC Excellence, Interplay Learning, TPC Training, and Mainstream Engineering (refrigerants.com). Cost runs $20–$59 for online courses that take 2–4 hours. Carrier and Daikin authorized dealers can access free factory training through their respective manufacturer portals.

For states where you're tracking potential future adoption — Michigan, Pennsylvania, Ohio, North Carolina — check in with your state contractor licensing board annually. Code adoption cycles typically move on 3-year intervals aligned with ICC publication cycles, and the 2024 IMC includes strengthened A2L provisions that will pull in tighter requirements when adopted.

The fastest way to see where your state currently stands: the HVACJobs.IO A2L Transition Center has a state-by-state requirement checker that reflects current adoption status and links to the source regulations for each jurisdiction. If you're in a mandatory state and your crew isn't yet compliant, the training itself takes an afternoon. The certification paperwork takes five minutes. There's no reason to be exposed.

Frequently Asked Questions

Which states require A2L training in 2026?

As of mid-2026, states with statutory A2L training mandates include California, Colorado, Connecticut, Washington D.C., Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Oregon, Rhode Island, Vermont, and Washington State. Several of these have been in effect since mid-2023. Use the HVACJobs.IO A2L state checker for the current status of your state.

Do I need new certifications or is EPA 608 enough?

EPA 608 remains the baseline federal certification for refrigerant handling and has not changed. What's new is the state-level requirement for documented A2L safety training in jurisdictions that have adopted ASHRAE 15.2 provisions. These are separate from each other — you need both your 608 and the A2L safety training documentation in mandatory states.

My state isn't on the mandatory list. Do I still need the training?

For warranty purposes, yes. Every major OEM requires documented A2L training as a warranty condition, regardless of state law. Additionally, even in non-mandatory states, local AHJs — city and county building departments — can adopt current mechanical codes independently. Verify with your local building department, not just the state code.

How long does A2L training take and what does it cost?

Online A2L safety courses run 2–4 hours. Costs range from free (for authorized Carrier or Daikin dealers through manufacturer portals) to $20–$59 for third-party providers. ESCO Group, HVAC Excellence, and Interplay Learning are widely accepted. Mainstream Engineering's course at $20 is the lowest-cost option with accepted documentation.

What happens if a tech works on A2L equipment in a mandatory state without documented training?

The consequences range from failed mechanical inspections and permit holds to voided OEM warranties. In states where A2L training is a licensing condition (Massachusetts is the clearest example), working without documentation is a licensing compliance issue — not just a permitting issue.

Does Texas require A2L training?

No. Texas has no statewide A2L training mandate as of mid-2026, and TDLR has not yet incorporated A2L requirements into HVAC contractor licensing. However, OEM warranty requirements apply regardless of state law. Given Texas's position as one of the highest-volume HVAC markets in the country, documented A2L training is strongly advisable for any tech doing new equipment installs.

Can local cities require A2L training even when the state doesn't?

Yes. Local authorities having jurisdiction (AHJs) can adopt current model codes independently of the state. Chicago, for example, has historically adopted IMC editions ahead of the Illinois state code. If you're working in a major metro in a non-mandatory state, contact the local building department to confirm the current mechanical code edition in effect.

Where can I verify my state's current A2L requirement status?

The HVACJobs.IO A2L Transition Center provides a current state-by-state breakdown with source citations. State mechanical code offices and licensing boards are the authoritative sources for specific enforcement questions.

For the full A2L transition picture — refrigerant properties, equipment tool requirements, and the supply situation — see the A2L refrigerant transition overview.

The training itself is a half-day of your time and costs under $60. Book it through ESCO, HVAC Excellence, or your manufacturer's portal, keep the certificate in your service records, and the compliance question is answered.

Sources:

A2L Training Requirements by State: 2026 Complete Guide