Refrigerant Transition and HFC Phase-Down
The regulatory ladder
The Montreal Protocol (1987) drove the CFC phase-out (R-12, R-500) and the HCFC phase-out - U.S. production and import of R-22 for new equipment ended January 1, 2020, though reclaimed and recycled R-22 may still be used. HFCs do not deplete ozone and were never banned by Montreal, but the Kigali Amendment and the U.S. AIM Act (2020) require an 85% cut in HFC production and consumption by 2036 against a 2011–2013 baseline, managed through allowances and EPA rulemaking.
What changes for a technician
- GWP limits on new equipment under the Technology Transitions rule - for example, 700 GWP for new residential and light-commercial split systems below 65,000 Btu/h beginning in 2025, with other categories phased in.
- Virgin R-410A (GWP about 2,088) becomes scarcer and more expensive; reclaimed R-410A gains value.
- Replacement refrigerants include R-32 (GWP about 675, A2L), R-454B (about 466, A2L), R-466A (A1), and naturals such as R-290 (A3, small charge limits) and R-744.
- A2L refrigerants are mildly flammable: lower burning velocity but real ignition risk. Expect ignition-source mitigation, revised ventilation and room-volume rules, component rating requirements, and updated service practices.
Traps
Saying "R-410A is banned" - the phase-down caps production; it does not outlaw existing equipment or reclaimed supply. Treating an A2L replacement as a drop-in when oil, metering, controls, and charge limits may all change. Confusing ODP phase-out with GWP phase-down.
Worked example
With a baseline allowance of 100 units, a 40% step-down leaves 60 units available for that year; each company's allocation drops by the same percentage.
Rule of thumb
ODP gets a refrigerant banned; GWP gets it downsized.