A2L refrigerants — R-32, R-454B, R-454C, R-1234yf — are replacing high-GWP A1s like R-410A across new HVAC equipment under the EPA AIM Act phase-down. This course covers safety classification per ASHRAE 34, leak-detection methods, charge-limit calculations per UL 60335-2-40, and field-installation procedures specific to A2L systems. ~8 hours. Free with the Apprentice tier.
The EPA AIM Act phase-down requires an 85% reduction in HFC consumption by 2036. The intermediate milestone — January 1, 2025 — caps GWP for new residential AC and heat-pump equipment at 700, which effectively mandates A2L. Every new install you touch from 2026 onward is more likely to be A2L than A1.
R-454B's global warming potential vs ~2,088 for R-410A. About 78% lower.
Maximum allowed GWP for new residential AC + heat pump equipment manufactured after Jan 1, 2025.
HFC consumption phase-down target by 2036 under the AIM Act of 2020.
Carrier, Trane, and several other OEMs' choice for new residential and light commercial AC + heat pumps. GWP ~466.
Daikin, Mitsubishi, and most of Asia's choice. GWP ~675. Common in mini-splits.
Lower-charge applications. GWP ~148.
Auto AC standard since 2017. GWP <1.
~8 hours of focused training puts you ahead of most field techs on the 2026 transition. Free with Apprentice tier.