Low GWP refrigerants are becoming increasingly important. To help you out with figuring out which refrigerants have low GWP, we have created a **list of 69 refrigerants with the lowest GWP** *(from 0 GWP to 500 GWP)*. You can find the whole chart below.

In recent years and now, we are looking at these two refrigerant phasing-out directions:

- Phasing out high ODP (Ozone Depletion Potential) refrigerants. The main category here are the HFCs or hydrofluorocarbons. R-22 is the best example of this; that’s why you are also seeing $100 per lb prices for R-22 refrigerant.
**Phasing out of high GWP**()**G**lobal**W**arming**P**otential**refrigerants**. This will, in time, phase out common refrigerants like R-410A (2088 GWP) and R-404A (3920 GWP), and slowly replace them with low GWP refrigerants. That’s why refrigerants with the**lowest GWP are the future**.

In the low GWP refrigeration list below, you will see that some natural refrigerants (R-717 or Ammonia, R-728 or Nitrogen, R-704 or Helium, etc.) have **0 GWP**. These are refrigerants with the lowest *possible* GWP value.

By default, the No. 1 global warming gas – **carbon dioxid**e or **CO _{2}** – has a

**GWP value of 1**. Some of the most commonly used refrigerants have a well above 1000 GWP value; low GWP refrigerants are way below that (500 GWP or lower value).

Here is the full chart, with examples of these low GWP **natural, HO, HC, HCFO, HFO, HCFC, and HFC refrigerants** below the chart:

## Lowest GWP Refrigerant List

Low GWP Refrigerant: |
GWP (Global Warming Potential): |

R-704 (Helium) | 0 GWP |

R-717 (Ammonia) | 0 GWP |

R-720 (Neon) | 0 GWP |

R-728 (Nitrogen) | 0 GWP |

R-732 (Oxygen) | 0 GWP |

R-740 (Argon) | 0 GWP |

R-784 (Krypton) | 0 GWP |

R-729 (Air) | 0 GWP |

R-718 (Water) | 0.2 GWP |

R-E170 (Dimethyl Ether) | 1 GWP |

R-744 (Carbon Dioxide) |
1 GWP |

R-1233zd | 1 GWP |

R-510[A] | 1.24 GWP |

R-432A | 1.64 GWP |

R-1270 (Propene) | 1.8 GWP |

R-514A | 2 GWP |

HFO-1336mzz-Z (R1336mzz-Z) (DR-2) | 2 GWP |

R-433A | 2.85 GWP |

R-433C | 2.93 GWP |

R-600a (Isobutane) | 3 GWP |

R-436B | 3.16 GWP |

R-436A | 3.17 GWP |

R-511[A] | 3.19 GWP |

R-433B | 3.23 GWP |

R-290 (Propane) | 3.3 – 9.5 GWP |

R-441A | 3.6 GWP |

R-1150 | 3.7 GWP |

R-161 | 4 GWP |

R-1234yf | 4 GWP |

R-601 | 4 GWP |

R-601a | 4 GWP |

R-610 | 4 GWP |

R-600 | 4.0 – 6.5 GWP |

R-170 | 5.5 – 10.2 GWP |

R-702 | 5.8 GWP |

R-1234ze | 6 GWP |

R-30 | 8.7 GWP |

R-40 | 13 GWP |

R-429A | 13.9 GWP |

R-152 | 16 GWP |

HFO-1336mzz-E | 18 GWP |

R-611 | Below 25 GWP |

R-1130 | Below 25 GWP |

R-435A | 25.6 GWP |

R-50 (Methane) | 28 GWP |

R-20 | 31 GWP |

R-431A | 38.3 GWP |

R-123a | 77 GWP |

R-123b | 77 GWP |

R-123 | 79 GWP |

R-430A | 95 GWP |

R-41 | 116 GWP |

R-225ca | 127 GWP |

R-152a | 138 GWP |

R-457A | 139 GWP |

R-440A | 144 GWP |

R-455A | 146 GWP |

R-21 | 148 GWP |

R-454C | 148 GWP |

R-140a | 160 GWP |

R-454A | 239 GWP |

R-744A | 265 GWP |

R-245mf | 286 GWP |

R-143 | 328 GWP |

R-347mmy | 343 GWP |

R-254pc | 359 GWP |

R-22B1 | 404 GWP |

R-454B | 466 GWP |

Here is how these low global warming potential (GWP) refrigerants break down, based on the type of the refrigerants:

**Natural refrigerants**have the. These are*lowest*possible GWP value**0 GWP**refrigerants like Helium, Ammonia, Neon, Nitrogen, Oxygen, Argon, and Air. They have no global warming impact whatsoever. Carbon dioxide with 1 GWP is also considered one of the lowest GWP refrigerants.**HC refrigerants**(**h**ydro**c**arbons) have quite a low GWP value. HC with the lowest GWP values are R-E170 (dimethyl ether) with 1 GWP, R-510[A] with 1.24 GWP, R-600a (isobutane) with 3 GWP, R-436B with 3.16 GWP, R-436A with 3.17 GWP, and R-290 (propane) with 3.3 to 9.5 GWP. Methane or R-50 is also an HC refrigerant with a relatively low 28 GWP value.- One
**HCFO refrigerant**(**h**ydro**c**hloro**f**luoro**c**arbons) has very low GWP values as well; this is the new**R-1233zd**with 1 GWP. - Many HO (hydroolefins) refrigerants have exceptionally low GWP values. Examples include R-432A with 1.64 GWP, R-1270 (propane) with 1.8 GWP, R-433A with 2.85 GWP, R-433C with 2.93 GWP, R-433B with 3.23 GWP, and R-1150 (ethene) with 3.7 GWP.
- Examples of low GWP
**HFO refrigerants**(**h**ydro**f**luoro**o**lefins) include the new HFO-1336mzz-Z (R1336mzz-Z) (DR-2) with 2 GWP, R-514A with 2 GWP, very popular R-1234yf with 4 GWP, R-1234ze with 6 GWP, and HFO-1336mzz-E with 18 GWP. - Examples of low GWP
**HFC refrigerants**(**h**ydro**f**louro**c**arbons) include R-161 with 4 GWP, R-429A with 13.9 GWP, R-152 with 16 GWP, R-435A with 25.6 GWP, R-431A with 38.3 GWP, and so on. - Examples of low GWP
**HCC refrigerants**(**h**ydro**c**hloro**c**arbons) include R-30 with 8.7 GWP, R-40 with 13 GWP, R-20 with 31 GWP, and R-140a with 160 GWP. - Examples of GWP
**HCFC refrigerants**(**h**ydro**c**hloro**f**luoro**c**arbons) include R-123 with 79 GWP, R-225ca with 127 GWP, and R-21 with 148 GWP.

With this list of the lowest global warming potential refrigerants, and the examples listed here, you now have a full overview of which refrigerants have the lowest GWP values.