EPA 608 certification covers Section 608 of the Clean Air Act, but the regulations on refrigerants reach beyond Section 608. If you are new to the credential, see our overview of what EPA 608 certification is before reading this guide. The American Innovation and Manufacturing Act (AIM Act) is the most significant U.S. refrigerant law since the Montreal Protocol, and its 2025 and 2026 milestones are now changing what refrigerants appear in new equipment, what leak duties apply, and what the EPA 608 exam tests.
What the AIM Act is and why it matters for EPA 608
The AIM Act authorizes EPA to phase down the production and consumption of hydrofluorocarbons (HFCs) through an allowance system, replacing them with lower GWP alternatives. The law is codified at 42 U.S.C. 7675 and implemented through EPA rules under 40 CFR Part 84. It targets an 85% reduction in U.S. HFC production and consumption by 2036, measured against the 2011 to 2013 baseline.
The AIM Act works through three tools: allowances (production and import limits), Technology Transitions (equipment level phasedowns that mandate new refrigerant use), and HFC Management Rules (handling, reporting, and leak repair duties).
Why it matters for EPA 608 technicians
The Technology Transitions and HFC Management Rules decide which refrigerants you meet in the field and what A2L handling knowledge is tested on the exam. A technician who learned the 608 facts before 2025 may be studying outdated information about equipment and refrigerants.
If you are already certified, here is what actually changes
Your certification status does not change. EPA 608 certification has no expiration date, and the AIM Act adds no recertification requirement. The passing standard for the exam is also unchanged: 18 of 25 (72%) per section, with Universal covering all four sections for 100 questions total. What changes is operational, and it applies to the work, not the card.
- New equipment uses A2L refrigerants. R-454B and R-32 are now standard in new residential systems, and they handle differently from R-410A.
- Expanded leak and recordkeeping duties. The AIM Act HFC Management Rule layers reporting and leak repair obligations on top of the Section 608 framework.
- A2L safety knowledge is expected. Many employers ask for voluntary A2L training even though it is not federally mandated.
Stay current even without recertification
The card does not expire, but the rules and equipment do change. Reviewing current A2L procedures before servicing new equipment is a professional obligation, not a re-exam.
2026 deadlines and the R-410A phasedown
Beginning January 1, 2025, the AIM Act Technology Transitions Rule limited production of R-410A based equipment. New residential HVAC equipment built in 2025 and beyond primarily uses A2L refrigerants, R-454B and R-32, with GWP far below R-410A (466 and 675 respectively, versus R-410A at 2,088).
R-410A itself remains available for servicing existing systems through current supply channels and reclamation. Only new equipment production is affected, so you will service R-410A systems in the field for decades as existing equipment stays in use.
What this means for the exam
Certifying organizations (ESCO, Mainstream Engineering, HVAC Excellence) update the EPA 608 exam to reflect current rules. Questions increasingly test A2L refrigerant handling alongside the established Section 608 content.
A2L refrigerants on the EPA 608 exam: R-454B, R-32, and R-1234yf
A2L refrigerants are classified as mildly flammable under ASHRAE Standard 34. They need UL or ETL listed tools, proper ventilation, and A2L rated recovery equipment. The Type II section now includes A2L content, so a technician trained only on R-410A needs to understand the safety differences before servicing new equipment.
R-454B (Opteon XL41): the primary replacement for R-410A in new residential and light commercial split systems. GWP of 466, about 78% lower than R-410A. Already the dominant refrigerant in new residential equipment.
R-32: used in some new residential split systems as a standalone refrigerant. GWP of 675. Mildly flammable (A2L).
R-1234yf: the primary replacement in automotive MVAC systems (covered by Section 609, not 608), though technicians meet it in some commercial refrigeration applications.
What Type II technicians need to know about A2L
Key tested facts: A2L means mildly flammable, not explosive; ventilation differs from A1 refrigerants; ignition source management is required during service; A2L specific leak detectors are recommended; and equipment must be A2L rated.
New leak detection requirements under the AIM Act
The AIM Act HFC Management Rule expanded leak duties beyond the Section 608 framework. For larger equipment, it can require automatic leak detection rather than only periodic inspection, and it broadens reporting and recordkeeping. The exact charge thresholds and effective dates vary by equipment type and are set in the HFC Management Rule itself.
Exam note: two overlapping frameworks
For exam purposes, the EPA 608 exam still tests the Section 608 leak repair framework. The Section 608 leak repair rules apply to equipment with a refrigerant charge of 50 pounds or more. AIM Act HFC Management Rule duties are emerging exam content as certifying organizations update their question banks, so technicians sitting in 2026 should know both frameworks.
AIM Act HFC phasedown timeline
| Year | AIM Act milestone | Refrigerant or system affected |
|---|---|---|
| 2020 | AIM Act signed; HFC allowance system authorized | All HFCs (phasedown schedule starts) |
| 2022 to 2023 | First HFC production and import reductions | High GWP refrigerants including R-404A, R-507 |
| January 1, 2025 | Technology Transitions Rule: R-410A new equipment phasedown | New residential HVAC equipment |
| 2026 | HFC Management Rule duties phase in (handling, leak, recordkeeping) | HFC appliances by equipment type |
| 2028 | Next allowance reduction milestone | Further HFC production limits |
| 2036 | 85% phasedown target reached | All HFCs (full phasedown complete) |
AIM Act FAQ for EPA 608 technicians
Already certified? Get current on A2L before your next service call
Your card is still valid, but the equipment changed. The fastest way to close the A2L gap is to drill the Type II section, where A2L refrigerant handling and the current R-410A phasedown are now tested.