Understanding the Upcoming Switch to A2L Refrigerants 

Refrigerant Updates!

As of January 1, 2025, HVAC manufacturers are required to produce equipment that uses a class of refrigerants known as A2Ls. The specific refrigerant most companies will use is R-454B, also known as Puron Advance. This change is part of a broader effort to enhance environmental sustainability, combat global warming, and improve system efficiency. It will replace the current refrigerant, Puron, in all residential ductless, ducted, and light commercial products. At JK, we understand that any transition can bring about concerns and questions. Our goal is to provide you with clear information on why this switch is happening and to reassure you that purchasing a system and receiving service will proceed as normal. 

The Environmental Benefits of A2Ls 

One of the primary reasons for the switch to A2Ls is their environmental benefits. Traditional refrigerants, such as R-22, have significantly contributed to ozone depletion and global warming, with a global warming potential (GWP) of 1,810. R-454B, on the other hand, is a hydrofluorocarbon (HFC) with no chlorine content, meaning it does not deplete the ozone layer. It also has a lower GWP of 466, compared to the previous refrigerant standard. This is why many companies are switching to this specific A2L for the future. By transitioning to R-454B, the HVAC industry is taking a substantial step toward reducing its environmental footprint and aligning with global efforts to combat climate change. 

Enhanced Efficiency and Performance 

Puron Advance is not only better for the environment but also enhances the performance of HVAC systems. This refrigerant operates at a higher pressure than older refrigerants, resulting in better energy efficiency and improved heat transfer properties. Systems using A2Ls can be more compact and deliver superior cooling and heating performance, making them more efficient overall. For consumers, this means potential savings on energy bills and a more reliable and effective heating and cooling solution. 

Addressing Concerns 

Some concerns have been raised about the flammability of A2Ls due to their classification. For context, all refrigerants are rated for toxicity and flammability. The classification consists of three parts: ‘A’ represents nontoxic and ‘B’ represents toxic. The second digit can be 1, 2, or 3, where 1 is not flammable, 2 is slightly flammable, and 3 is very flammable. The ‘L’ means that the refrigerant is less flammable than the standard indicated by the previous number. Therefore, A2L stands for a nontoxic, less than slightly flammable refrigerant. A2L refrigerants are very challenging to ignite and have a very low flame speed. Despite being considered mildly flammable, they do not pose any significant risk to installers, service technicians, or homeowners. 

For A2L refrigerants to ignite, a substantial energy source, like a direct flame or a high concentration of refrigerant, is necessary. Even if an A2L refrigerant were to ignite, the flame would be unsustainable and spread at an extremely slow speed, less than half a mile per hour—slower than a walking pace. The systems also include new safety mechanisms, such as a leak dissipation system. This system will activate a blower to disperse any refrigerant into the air stream. With this safety measure, homeowners can be confident in the new system and refrigerant in their homes. Ensuring a Smooth Transition for Consumers 

Ensuring a Smooth Transition for Consumers 

At JK, we recognize that technology changes can sometimes be a concern, however, the transition to A2L is designed to be as smooth as possible. For those with older systems, numerous options are available, including retrofitting existing units or opting for new systems built to work with A2L from the start. Our team at JK is ready to assist you with any questions or concerns, ensuring that you experience a seamless transition. 


The upcoming switch to A2L in 2025 represents a positive move for both the environment and the efficiency of HVAC systems. This transition will help reduce the industry’s environmental impact while offering enhanced performance and energy savings for consumers. At JK, we are committed to supporting you through this change, ensuring you have all the information and assistance you need. Together, we can embrace this change for a greener, more efficient future. As always, the heating, cooling, plumbing, and electrical experts at JK Mechanical are here to help with any of your needs! Contact us today!  

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