What Changed on the EPA 608 Exam for 2026: AIM Act and A2L Refrigerants

If you are studying for the EPA 608 exam from a guide that is a few years old, there is a real chance you are learning material that has changed. The biggest reason guides go stale is that refrigerant regulation moved, and a lot of older books predate the shift. Here is what is current.

The AIM Act and the HFC phasedown

The American Innovation and Manufacturing Act (the AIM Act) directs a phasedown of hydrofluorocarbons, the HFC refrigerants that replaced older ozone depleting ones. The phasedown steps production and consumption down over time, toward an 85 percent reduction by 2036.

This matters for the exam because it explains a question that confuses a lot of test takers: why a refrigerant like R-410A is still regulated even though it has zero ozone depletion potential. The answer is that HFCs carry high global warming potential, and that is what the AIM Act addresses. A guide written before this was in force will not frame the question correctly.

A2L refrigerants

The phasedown pushed the industry toward refrigerants with lower global warming potential, and many of those are A2L refrigerants, which are mildly flammable. Examples you should recognize are R-32 and R-454B. These are showing up in new equipment, and the safety and handling considerations are different from the older A1 refrigerants that most legacy study guides assume.

If your study material never mentions A2Ls, it is not current.

R-22 is reclaim only

R-22, the old workhorse refrigerant, is no longer produced or imported. Servicing equipment that still uses it relies on reclaimed R-22. Knowing that R-22 is reclaim only, rather than freely available, is the kind of current detail that separates an up to date guide from an outdated one.

Why this is the whole point of staying current

The EPA 608 exam tests federal regulation, and federal regulation changes. The GWP limits by sector, the phasedown steps, and the arrival of A2Ls are exactly the kind of material that older guides miss, and they are fair game on a current exam. Studying outdated material is the most avoidable reason capable techs walk in underprepared.

Whatever you study from, make sure it reflects the current rules, and verify specific requirements with the EPA and your testing organization before test day, since the regulation continues to evolve.