Do I need a separate A2L certification?

Your EPA 608 covers refrigerant handling. A2L work additionally requires following manufacturer and code requirements for mildly flammable refrigerants — training is strongly recommended, but it is not a separate federal certification.

Not gone, but new residential and light-commercial equipment can no longer be manufactured with it. Existing systems keep running, so R-410A service work continues alongside the new A2L equipment.

EPA 608 guide

A2L refrigerants: what changes on the job

The refrigerant transition is the biggest practical change in residential HVAC in a generation. Lower-GWP refrigerants — R-454B and R-32 in particular — are mildly flammable (ASHRAE 34 safety class A2L), and systems built for them behave a little differently. The good news: your Section 608 certification already covers the work.

Why the switch happened

The AIM Act phases down hydrofluorocarbons, and the EPA technology transition rule moved new residential and light-commercial AC and heat-pump equipment to refrigerants with a GWP of 700 or lower. That is why R-410A is being replaced by A2L blends and R-32 in new equipment. Installation restrictions applied from January 1, 2025, with a sell-through allowance for units manufactured before that date; a separate VRF deadline followed on January 1, 2026.

What A2L actually means

Mildly flammable — lower burning velocity than A3 (propane) or A2, but still a real hazard
Charge limits and ventilation rules apply to occupied spaces; check the system's labelling
No ignition sources during service; use the manufacturer's procedure and leak-detection guidance
Recovery equipment and cylinders must be rated for the refrigerant you are recovering
Leak testing and documentation matter more, not less, because charge is often smaller

What you need to learn

The exam itself still tests the same 608 fundamentals: recovery, leak rules, cylinders, safety. What changes is site practice — identifying A2L equipment, following charge-limit and ventilation requirements, and knowing what the manufacturer requires before you open a system. Our A2L & Low-GWP audio course covers exactly that half.

Frequently asked

Do I need a separate A2L certification?: Your EPA 608 covers refrigerant handling. A2L work additionally requires following manufacturer and code requirements for mildly flammable refrigerants — training is strongly recommended, but it is not a separate federal certification.
Is R-410A gone?: Not gone, but new residential and light-commercial equipment can no longer be manufactured with it. Existing systems keep running, so R-410A service work continues alongside the new A2L equipment.

Hear the A2L course walkthrough →

Audio lessons on the transition, charge limits and safe handling.

Hear the A2L course walkthrough →