GWP table · 40 CFR 84.64
Refrigerant GWP lookup
Cited · datedThe number that decides whether the 15-pound rule can apply to your refrigerant. Above 53, the section can apply; at or below, it cannot. Blends are computed by mass fraction, as the regulation says.
| Refrigerant | GWP (100-yr) | Above 53 | Note |
|---|---|---|---|
| R-404A | 3,922 | yes | common in walk-ins and display cases |
| R-507A | 3,985 | yes | HFC blend |
| R-410A | 2,088 | yes | rooftop units, split systems |
| R-407A | 2,107 | yes | HFC blend |
| R-407C | 1,774 | yes | HFC blend |
| R-407F | 1,825 | yes | HFC blend |
| R-134a | 1,430 | yes | reach-ins, chillers |
| R-448A | 1,386 | yes | HFO or HFO blend |
| R-449A | 1,396 | yes | HFO or HFO blend |
| R-452A | 2,140 | yes | HFO or HFO blend |
| R-513A | 630 | yes | HFO or HFO blend |
| R-450A | 601 | yes | HFO or HFO blend |
| R-32 | 675 | yes | HFC |
| R-454B | 465 | yes | the R-410A replacement in new equipment |
| R-454A | 237 | yes | HFO or HFO blend |
| R-454C | 146 | yes | HFO or HFO blend |
| R-455A | 146 | yes | HFO or HFO blend |
| R-1234yf | 1 | no | GWP under 53: outside the section |
| R-744 (CO2) | 1 | no | GWP under 53: outside the section |
| R-290 (propane) | 3 | no | GWP 3.3 in the table; under 53: outside the section |
| R-717 (ammonia) | 1 | no | GWP under 53: outside the section |
| R-22 | 1,810 | excluded (ODS) | an ozone-depleting substance: 40 CFR part 82 applies instead |
40 CFR 84.64(a), (b) and table 1; appendix A to part 84 · verified 2026-09-04 · the GWP section; the threshold is 84.106(a)(1), (a)(2)
How the numbers are made
A regulated substance carries the exchange value the AIM Act gave it: HFC-32 is 675, HFC-125 is 3,500, HFC-134a is 1,430, HFC-143a is 4,470. A blend is the weighted sum of its parts. R-404A is 44% HFC-125, 52% HFC-143a and 4% HFC-134a, which comes to 3,922. The non-HFC parts of the newer blends take the values in table 1: HFO-1234yf and HFO-1234ze(E) are 1, so R-454B, which is 68.9% HFC-32, lands at 465.
Whether the section applies is a four-part test, and this table is one part of it. The applicability checker runs all four.
Common questions
- Why does 53 matter?
- The leak repair section applies to appliances whose refrigerant is a regulated substance (an HFC) or a substitute with a global warming potential greater than 53, using the GWPs in table 1 of 40 CFR 84.64(b) (84.106(a)(2)). A refrigerant at or below 53 is outside the section on that test alone.
- How is a blend's GWP computed?
- The sum of each constituent's GWP multiplied by its nominal mass fraction (84.64(b)). R-410A is half HFC-32 at 675 and half HFC-125 at 3,500, which is 2,088. The regulated substances' values are the AIM Act exchange values in appendix A to part 84.
- What about R-22?
- R-22 is an ozone-depleting substance. An appliance containing solely an ozone-depleting refrigerant is excluded from 84.106 and stays under the leak repair requirements of 40 CFR part 82, subpart F, whose threshold is 50 pounds.