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Resource Center 2024 Guide to Low-GWP Refrigerant Changes & High-GWP Regulations

Guide to Low-GWP Refrigerant Changes

There is an increasing concern about the effect refrigerants are having on our planet in terms of their potential to trap heat in our atmosphere, a process commonly known as the Greenhouse Effect. To address these concerns, governments around the world are implementing refrigerant regulations to phase out refrigerants they believe pose too much risk to global warming. To do this they use a rating system which assigns a Global Warming Potential (GWP) number to refrigerants.

What is GWP?

Global warming potential measures how much infrared thermal radiation a material has contributed to the atmosphere. The GWP is base lined on the effect of natural Carbon Dioxide (CO2) to trap heat in the atmosphere. COhas a GWP of 1. Two of the more common refrigerants used in air-conditioning and process chillers today are R134a with a GWP of 1,430 and R410A with a GWP of 2,088. What that means is R410A has 2,088 more Greenhouse Effect than CO2.

Why is GWP important for refrigerants?

Many new refrigerant regulations and laws coming into effect have mandated a GWP of 750 or less. This has driven a major investment in research and development of new refrigerant and refrigerant components as well as changes to the manufacturing, installation, and maintenance of refrigeration systems and low-GWP chillers.

Rules and Enforcement Dates on High GWP Refrigerants

In 2016, the Environmental Protection Agency (EPA) passed a ruling known as the Significant New Alternative Policy (SNAP) 21, which prohibited the use of high-GWP refrigerants in new centrifugal and positive displacement chillers nationwide, effective as of January 1, 2024. However, this ruling was vacated by the court system a few years later. The California Air Resources Board (CARB) responded by enacting their own version of SNAP 21 on a state level, keeping in line with the original enforcement date. Additionally, 11 other states passed similar state-wide legislations restricting and banning high-GWP refrigerants as of January 1, 2024.

In 2021, the EPA began working on the Technology Transition Rule. Similar to SNAP 21, it regulates through sector-based high-gwp refrigerant restrictions. However, this time it is based on the legal foundation set forth in the American Innovation and Manufacturing (AIM) Act which was passed into law the previous year. The Technology Transition Rule is still pending approval, but it would require new chillers to use refrigerants below 700 GWP starting on January 1, 2026.

Global Warming Potential Regulations Timeline


The multitude of rulings and enforcement dates, along with the tight deadlines of the state regulations have left manufacturers conflicted and confused. Combined with the fact that low-GWP refrigerants have different thermodynamic properties than high-GWP refrigerants, so major component changes are required, many companies may find themselves unprepared or unable to produce equipment with the new components needed.

Thermal Care Offers Low-GWP Refrigerants & Products

Thermal Care has been researching and preparing for these changes for the past two years and is ready to provide the appropriate low-GWP chiller & refrigerant solutions for any customer’s needs. While other manufacturers may be struggling to find the right components, Thermal Care began implementing multi-refrigerant compressors in early 2023. This allows us to offer low-GWP compliant chiller products today, well ahead of the required deadlines, and to maintain the same cooling capacities and physical dimensions as our previous products. 

We selected R-454B as our alternative to R-410A and R-513A as our alternative to R-134a. R-134a, R-410A, and R-513A are all classified as A1 refrigerants by ASHRAE, meaning they are non-toxic and non-flammable. However, R-454B is classified as A2L refrigerant, which means it is slightly flammable.  Despite its classification, R-454B is much closer to an A1 refrigerant than an A3 refrigerant, or highly flammable, like propane. However, the end-user may need to install safety equipment in accordance with local and federal codes and regulations. It is the responsibility of the installing contractor or owner to confirm that the GWP values for refrigerants meet their respective state and local codes.

States with Upcoming Low GWP Installation Guidelines


The transition to low-GWP chillers is necessary to reduce greenhouse gas emissions and protect the environment, but it will have substantial effects on chiller manufacturers. Those that can successfully shift to low-GWP chillers will be well-positioned to succeed in the future. 

Thermal Care is one example of a manufacturer that has prepared for this transition and can offer low-GWP compliant chillers and products immediately, well ahead of the required deadlines and helping to make a difference in the fight against climate change.