HFC (hydrofluorocarbon)
Short answer · Updated 2026
HFC stands for hydrofluorocarbon: a refrigerant made of hydrogen, fluorine and carbon with no chlorine, so its ozone depletion potential is zero. Common HFCs include R-134a (GWP 1,430), R-410A (2,088) and R-404A (3,922). Because many trap heat strongly, US production is being phased down under the AIM Act, with lower-GWP options such as R-32 (675) and HFOs taking their place.
Common HFC refrigerants and their GWP
| Refrigerant | Type | Typical use | GWP (100-year) |
|---|---|---|---|
| R-134a | Single HFC | Car AC (older), chillers, refrigerators | 1,430 |
| R-410A | HFC blend | Residential AC and heat pumps | 2,088 |
| R-404A | HFC blend | Commercial refrigeration | 3,922 |
| R-407C | HFC blend | R-22 replacement in AC | 1,774 |
| R-32 | Single HFC | Newer AC and heat pumps | 675 |
| R-1234yf (HFO) | Hydrofluoroolefin | Newer car AC | Single digits |
Hydrofluorocarbons are refrigerants built from hydrogen, fluorine, and carbon with no chlorine at all. Removing the chlorine removed the ozone problem: an HFC molecule that escapes to the atmosphere carries nothing that catalytically destroys stratospheric ozone. For that reason HFCs became the dominant replacements as the chlorine bearing families were phased out, and they now fill a large share of the equipment a working technician touches.
Solving one environmental problem exposed another. Many HFCs are potent greenhouse gases, absorbing infrared radiation far more effectively than carbon dioxide does, so releases contribute to climate warming even though they leave the ozone layer alone. This is why refrigerant policy did not end with the chlorine phaseout: attention shifted to global warming potential, and the industry is again in transition toward lower impact alternatives.
For certification purposes, the essential HFC facts are conceptual. They are ozone safe but climate relevant, they are regulated and must be recovered rather than vented, and they represent the current mainstream rather than the final destination of refrigerant chemistry. A candidate who can articulate why the industry moved to HFCs and why it is now moving beyond them understands the arc the Core exam material is really describing.
Common questions
What is the difference between HFO and HFC?
HFOs (hydrofluoroolefins) are HFCs with a carbon double bond, which makes them break down in days to weeks in the atmosphere instead of years. That gives them very low global warming potential, in the single digits for R-1234yf, against 1,430 for R-134a. Many are mildly flammable (A2L), which changes handling rules.
Do HFC refrigerants deplete ozone?
No. HFCs contain no chlorine or bromine, so their ozone depletion potential is zero. The concern with HFCs is climate: many have global warming potentials in the thousands, which is why they are being phased down.
Do I need EPA 608 certification to handle HFCs?
Yes. The Section 608 venting prohibition and recovery requirements cover substitute refrigerants such as HFCs, and buying HFC refrigerant for stationary equipment requires certification.
Sources
- Global warming potentials: IPCC Fourth Assessment Report, as adopted in EPA's AIM Act regulations (40 CFR Part 84).
- HFC phasedown: American Innovation and Manufacturing (AIM) Act of 2020 and EPA's implementing rules.
- Venting prohibition and sales restrictions for substitutes: 40 CFR Part 82, Subpart F (82.154).
Related terms
| Global warming potential (GWP) | A measure of how much heat a substance traps in the atmosphere relative to carbon dioxide. |
| HCFC (hydrochlorofluorocarbon) | A transitional refrigerant family that added hydrogen to reduce, but not eliminate, ozone depletion. |
| Refrigerant | The working fluid that absorbs and releases heat as it cycles between liquid and vapor inside a refrigeration system. |
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