HFC-134a: a Potent Greenhouse Gas It is the most abundant
Why Is R-134A Being Phased Out? When Is the Phaseout Expected to Conclude? Like a lot of '90s relics, R-134A has not aged well. It was known then that 1,1,1,2-tetrafluoroethane could potentially contribute to acid rain and that its ozone layer depletion potential was high.
The AIM Act is a Federal nationwide rule phasing out the use of global warming materials. As part of that effort, EPA is now banning the use of 134a in aerosol products as of 1/1/2025. There are excepted products that are allowed to use 134a until 1/1/2028.
A High-Performing Alternative to R-134a
Opteon™ XL10 (R-1234yf) refrigerant is a non-ozone depleting (ODP) hydrofluoroolefin (HFO) option that meets the industry's growing demands for sustainable, safe, and effective solutions.
The sales restriction is established by EPA regulations (40 CFR Part 82, Subpart F ) under Section 608 of the Clean Air Act. Only EPA-certified technicians are allowed to purchase ozone-depleting substances (ODS) or non-ozone depleting substitutes used as refrigerants, with limited exceptions.
R513A was developed as a replacement refrigerant for R134a. R513A is a modern, non-flammable refrigerant designed to replace R134a in a wide range of applications. It provides a sustainable solution for both new systems and retrofits.
While R-1234yf could be the perfect replacement for R-134a, there is one major challenge with this new technology. The R-1234yf is much more reactive than R-134a. On the positive side, this higher reactivity is why R-1234yf is so much more friendly to the environment.
While some existing systems can still use R134a, many newer HVAC units are switching to eco-friendly refrigerants. Cars manufactured after 2021 in the United States can no longer use R134a and an alternative must be used. Due to R134a's high GWP, it's unsuitable for new equipment in the long run.
According to its manufacturer, Chemours, use of R-1234yf has grown so much since the refrigerant replaced the long-established R-134a that it's now used in 95% of new cars sold in the U.S. An estimated 220 million cars on global roads are also using it.
In most cars that are on the road today, R134a refrigerant makes the A/C system blow cold on hot days. Selected for its low flammability and safety, as well as because it's kinder to the environment, almost every car built since 1994 is equipped with R134 refrigerant. However, kinder is the key word.
134a is banned for new LD vehicles in the U.S. as of October 2024. 134a production is being reduced by EPA [Environment Protection Agency] mandate for all HFCs in the U.S. 1234yf could possibly be caught up in PFAS bans in Europe and U.S. unless exemptions are made.
Suffocation (asphyxiant) hazard - if allowed to accumulate to concentrations that reduce oxygen below safe breathing levels. Prolonged inhalation may be harmful. Contact with liquefied gas might cause frostbites, in some cases with tissue damage. Expected to be a low ingestion hazard.
R-134a is an HFC refrigerant and cannot be vented under the Venting Prohibition because it is a non-exempt substitute of CFCs and HCFCs.
HFC-134a will no longer be allowed in nonroad vehicles as of January 1, 2028. Servicing of existing vehicles using HFC-134a with HFC-134a will not be impacted and will continue to be allowed.
Still, the answer is an emphatic, “No.” Not only would a retrofit of this type negate the environmental benefits of R-1234yf, but it would also be a violation of Federal Law under Section 203 of the Clean Air Act: “tampering” with a vehicle's emissions control device.
R-454B is the new refrigerant in 2024. By 2025, the EPA's required phaseout of R-410A will be in full effect, with production, importation, and distribution no longer allowed. HVACR businesses must be evaluating their current choices in coolant and ready to make the jump.
The GWP for R-134a refrigerant is 1,430, making it 1,430 times more harmful than carbon dioxide when released into the atmosphere. There are three refrigerants that can be used to replace R-134a: R-1234yf, R-152a, and R-744.
Another HFC R-134a typically used in automobiles, will not be permitted to be used in Model Year 2021 vehicles; however, R-134a is not restricted for use in chillers. Even though HFCs are under scrutiny, they remain the right choice for chillers and other industrial cooling uses.
R32 and R152a have a reduced global warming potential than R134a, which indicates that R32 can be used as substitute for R134a in refrigeration systems.
R515B—As of February 2020, Honeywell has developed a new R134a replacement called Solstice N15, or R515B. It's a non-flammable A1 refrigerant that's a blend of R227ea and R1234ze, with a GWP a little under 293 with similar efficiency outputs as R134a.
R134a is not an ozone-destroying agent, but it is a greenhouse gas, and is illegal to vent as well.
No, the compressor will fail. These two refrigerants have very different properties. One of R22 and R134a is high pressure and the other is low pressure. They don't mix chemically and don't have the same boiling point, leading to inefficiencies and eventual compressor failure.
Possible alternatives to R-134a
Attention is increasingly focused on low-GWP refrigerants that are hydrofluoroolefins (HFO). R-1234yf in particular is often seen as a possible alternative to R-134a. The GWP value of R-1234yf is 4, which means it has a very low global warming potential.
R-1234yf systems that control freeze protection by pressure may encounter loss of cooling performance if charged with 100% R-134a. This is due to the requirement of R-134a to have a lower setting of 3.3 psig to achieve freeze protection at 32 F. This may result in a 4-degree F.
Using R152a as a drop-in replacement of R134a can increase the system efficiency and capacity, but R152a is flammable. By adding R134a or R227ea to R152a can reduce the flammability of the mixture.