Looking for a low-GWP R410A alternative? R454B refrigerant is one of the main replacements now being used in new HVAC systems.
Here’s what you need to know before switching to R454B. Learn its physical properties, PT chart, and compatibility for HAVC systems.
What Is R454B Refrigerant?
R454B is a binary refrigerant blend consisting of 68.9% R32 (difluoromethane) and 31.1% R1234yf (hydrofluoroolefin). It’s classified as an HFC/HFO zeotropic blend with a temperature guide of approximately 0.6 ℃. You’ll mostly see it used as a replacement for R410A systems. You should note that it is intended for new equipment specifically designed for A2L refrigerants and is not considered a direct drop-in replacement for existing R410A systems.
R32 delivers strong cooling performance and stable pressure. R1234yf lowers the GWP significantly. They balance performance and low environmental impact.
R454B is mainly used for air conditioning and heat pumps. If used for cold storage, it is only suitable for high-temperature preservation warehouses (such as fruit and vegetable preservation), and not suitable for medium and low-temperature freezing warehouses (meat and seafood freezing).
Properties of R454B Refrigerant
Physical Properties
In real systems, R454B refrigerant performs very close to R410A. That’s why it’s widely used as a replacement for R410A. Its low boiling point supports efficient heat transfer.
It has a very low temperature glide, so performance stays stable. Its critical temperature and critical pressure align with the high-pressure operating range of conventional heating and cooling equipment, so it works with most standard HVAC systems.
The liquid density at room temperature and saturated vapor density of R454B differ very little from those of R410A. When retrofitting older systems, existing piping can still be used, but system checks are required.
You can refer to the table below to determine whether the R454B refrigerant’s physical properties are suitable for your refrigeration system.
| Properties | R454B Refrigerant |
| Composition | 68.9% R32
31.1% R1234yf |
| molecular weight | 62.614kg/kmol |
| Boiling Point | -50.49℃ |
| critical temperature | 78.1℃ |
| critical pressure | 50.2bar |
| Saturated vapor pressure (25 ℃) | 1515.9 kPa |
| ODP | 0 |
| GWP (IPCC) | 466 (AR5) / 454 (AR6) |
| ASHRAE safety rating | A2L (Lower Toxicity, Mildly Flammable) |
| Oil | POE |
| Temperature Glide | ~0.6°C |
Chemical Properties
Knowing how R454B refrigerant reacts helps you avoid common system problems, including corrosion, material degradation, and oil incompatibility.
R454B refrigerant has a chemically stable structure. It remains stable under normal storage conditions. It has a long shelf life and requires no special precautions for warehousing or storage.
Under normal operating conditions, it does not react chemically with the metal components inside the system. Only under extreme conditions—such as exposure to open flames or ambient temperatures exceeding 250°C—does it slowly decompose to produce trace amounts of corrosive substances. You should keep equipment away from open flames and high heat sources.
It’s compatible with common HVAC metals like copper, aluminum, and steel. It will not cause pitting or crevice corrosion.
When selecting seals, prioritize EPDM rubber, nitrile rubber, and PTFE. Never use natural rubber, as it is prone to swelling, deformation, and seal failure.
Oil compatibility matters. R454B refrigerant must only be used with POE polyester refrigeration oil. It must never be mixed with mineral oil or alkylbenzene refrigeration oil. These oils are highly incompatible, and mixing them will result in serious issues such as oil film separation, loss of lubrication, compressor seizure and burnout, and blockage of throttling components in the piping.
R454B Pressure Temperature Charts (PT Chart)
| R454B (PSIG) | ℉ | ℃ |
| 9.5 | -40 | -40 |
| 12.7 | -35 | -37.2 |
| 16.3 | -30 | -34.4 |
| 20.1 | -25 | -31.7 |
| 24.3 | -20 | -28.9 |
| 28.9 | -15 | -26.1 |
| 34 | -10 | -23.3 |
| 39.4 | -5 | -20.6 |
| 45.3 | 0 | -17.8 |
| 51.7 | 5 | -15 |
| 58.6 | 10 | -12.2 |
| 66 | 15 | -9.4 |
| 74 | 20 | -6.7 |
| 82.5 | 25 | -3.9 |
| 91.7 | 30 | -1.1 |
| 101.5 | 35 | 1.7 |
| 111.9 | 40 | 4.4 |
| 123.1 | 45 | 7.2 |
| 135 | 50 | 10 |
| 147.6 | 55 | 12.8 |
| 161 | 60 | 15.6 |
| 175.3 | 65 | 18.3 |
| 190.4 | 70 | 21.1 |
| 206.4 | 75 | 23.9 |
| 223.3 | 80 | 26.7 |
| 241.1 | 85 | 29.4 |
| 260 | 90 | 32.2 |
| 279.9 | 95 | 35 |
| 300.8 | 100 | 37.8 |
| 322.8 | 105 | 40.6 |
| 346 | 110 | 43.3 |
| 370.4 | 115 | 46.1 |
| 395.9 | 120 | 48.9 |
| 422.8 | 125 | 51.7 |
| 450.9 | 130 | 54.4 |
| 480.4 | 135 | 57.2 |
| 511.3 | 140 | 60 |
| 543.6 | 145 | 62.8 |
| 577.4 | 150 | 65.6 |
Why Do You Choose R454B Refrigerant?
Meets Global Regulations
Many countries now restrict high-GWP refrigerants. The EU F-Gas Regulation, the U.S. EPA SNAP certification rules, and China’s refrigerant emission reduction policies all limit high-GWP refrigerants in new systems.
With a GWP of just 466, R454B remains well below the regulatory threshold. It is one of the few mainstream refrigerants that can be used in full compliance with current regulations and will not be subject to future phase-out restrictions. For equipment manufacturers, installation contractors, and end users, choosing R454B helps you avoid future compliance issues, so you don’t have to worry about future bans during long-term operation.
Good Performance and Environmental Protection
While there are many low-GWP alternatives on the market, most have significant drawbacks. Some meet environmental standards but lack sufficient cooling capacity, requiring heat exchangers to be redesigned. Others offer excellent performance but have high flammability, necessitating costly explosion-proof retrofits.
The greatest advantage of R454B is that its cooling capacity, operating pressure, and temperature curves closely match those of R410A. There is virtually no need to redesign the overall unit framework, compressor structure, or heat exchanger dimensions. You only need to make minor adjustments to the expansion valve matching and switch to a compatible refrigeration oil to complete the adaptation. This significantly reduces your R&D costs, tooling costs, and equipment retrofitting costs.
Advantages of R454B Refrigerant
Lower Environmental Impact
R454B has a GWP of approximately 466, which is about 78% lower than R410A’s GWP of 2088. It offers significant emission reductions compared to traditional refrigerants such as R410A and R22. Its zero ozone depletion potential aligns with global environmental standards, and it will not be added to the list of restricted or phased-out substances for decades to come. This ensures long-term, stable operation after you purchase equipment or retrofit systems, eliminating the need for frequent equipment replacements due to changes in refrigerant policies.
High Thermal Efficiency
R454B transfers heat efficiently, helping improve overall system performance. R454B’s cooling and heating capacities differ very little from those of R410A, and it exhibits excellent pressure-temperature matching.
In most cases, your system will run slightly more efficiently than with R410A. In high-temperature outdoor conditions during summer, the energy efficiency advantage becomes even more pronounced, effectively reducing operational energy consumption and helping you save on long-term electricity costs.
If your refrigeration system uses R454B refrigerant, it maintains excellent lubrication within the compressor and keeps your system running reliably during long-term continuous operation.
Strong Compatibility
For existing R410A equipment, R454B offers exceptional compatibility. Many existing components can still be reused, depending on the system condition. Retrofit is possible, but it requires proper system cleaning and setup adjustments.
You’ll need to replace the oil with POE, fine-tune the expansion valve opening, and install a compatible dry filter. The overall retrofit cost is significantly lower than replacing the entire unit.
Safety
Certified to ASHRAE standards, R454B has an A2L safety rating, indicating low toxicity and low flammability with a high lower flammability limit. You can manage safety risks easily if you follow standard installation rules.
Refrigerant leaks are easily detected by professional detectors, and the gas tends to accumulate in low-lying areas, making leaks easier to detect and ventilate. As long as installation standards are strictly followed, safety hazards can be completely avoided.
Simple Charging and Maintenance
Although it is a blended refrigerant, R454B refrigerant exhibits minimal temperature drift. You can charge it using the liquid-charge method, just as you would with R410A, without the need for complex mixing or calibration.
Even after minor leaks, the deviation in refrigerant composition is negligible; simply top up the system to restore normal operation. There is no need to evacuate the entire unit and recharge it from scratch. Maintenance personnel can perform routine inspections and charging operations without requiring specialized or complex training.
Limitations of R454B Refrigerant
Low Flammability
Although the flammability risk of R454B refrigerant is significantly lower than that of refrigerants such as R32 and propane, it is still classified as A2L flammable. In the event of a large leak in an enclosed, unventilated space, there remains a risk of combustion if the refrigerant comes into contact with open flames or high-temperature equipment.
You need proper ventilation and leak detection systems during equipment room planning, use properly rated electrical components, and install refrigerant leak detection and interlocked ventilation alarm systems. Don’t skip basic safety measures.
High Requirements for Retrofit Operations
R454B refrigerant is compatible only with POE (polyolester) oil and cannot be used with mineral oil or alkylbenzene oil. When retrofitting existing systems, you must thoroughly clean residual old oil from the piping to ensure no impurities or oil residue remain. Otherwise, this can easily lead to lubrication failures and pipe blockages.
Compared to refrigerants that are directly compatible, the retrofitting process is more rigorous and requires skilled technicians.
Frequent Maintenance
As a binary refrigerant, R454B has slight differences in the molecular escape rates of its two components. Long-term micro-leaks in the equipment can cause an internal imbalance in the mixture ratio, directly leading to reduced cooling capacity, abnormal operating pressure, and a decline in overall system efficiency.
You should check refrigerant levels regularly. When deviations exceed standards, you should promptly replenish or completely replace the refrigerant, which increases the workload of daily maintenance.
Low-Temperature Cooling Efficiency
In severe cold conditions with outdoor temperatures of -10°C or lower, R454B’s heating capacity and coefficient of performance (COP) are slightly lower than those of R410A. Relying solely on the refrigerant itself may not meet heating demands in extremely cold regions.
If you are selecting equipment for projects in northern regions with severe cold, you will need to pair it with a flash-injection compressor or an auxiliary electric heater to compensate for its shortcomings in low-temperature performance.
High Costs
Because of the production costs of R1234yf raw materials, the market price of R454B refrigerant is higher than that of R410A refrigerant. Costs for bulk procurement and equipment charging will increase. However, from a full life-cycle perspective, the higher energy efficiency can offset the price difference, and the total long-term operating costs remain advantageous.
Applications of R454B Refrigerant
Because of its performance, lower environmental impact, and excellent adaptability, R454B is now widely used in residential, light commercial, and large-scale commercial HVAC and refrigeration systems.
- Residential air conditioning systems
- Commercial HVAC systems
- Heat pumps
- Data center centers
- EV thermal management systems
Which refrigerants can R454B replace?
R454B is primarily intended to replace R410A, while also partially replacing high-GWP refrigerants such as R22, R134a, and R407C. It is currently the primary choice in the replacement portfolio.
R410A
R410A (GWP=2088) was once the mainstream refrigerant for residential air conditioners and heat pumps and is classified as a high-GWP refrigerant. Global policies restrict its use, and it will be completely banned in new equipment after 2025.
R454B exhibits cooling capacity and pressure characteristics highly consistent with R410A. Its system offers strong compatibility, and it has low retrofit costs, making it a replacement for R410A. Over 90% of R410A systems can replace to R454B through simple retrofits.
R22
R22 (GWP=1810) is a refrigerant used in traditional air conditioners and chillers. It has been phased out globally (after 2020), and existing equipment must be retrofitted.
R454B operates at a pressure 10%–15% higher than R22, with 5%–8% greater cooling capacity and 10%–15% higher energy efficiency. It can replace R22 in air conditioning and heat pump systems, but it needs a reinforced system pressure-resistant design, replacement of POE oil, and fine-tuning of the expansion valve. It is suitable for retrofitting medium- to large-scale R22 systems.
R454B vs R410A
Here’s a chart to help you decide:
| Feature | R454B | R410A |
| GWP (Global Warming Potential) | 466 | 2088 |
| Environmental compliance | Meets new regulations | Being phased out |
| Energy efficiency | Slightly higher | General |
| Cooling performance | Very similar | |
| Operating pressure | Slightly lower | Higher |
| Safety Standard | A2L (mildly flammable) | A1 (non-flammable) |
| Retrofit difficulty | Moderate | — |
| Future availability | Long-term | Declining |
R454B vs R32
| Property | R454B | R32 |
|---|---|---|
| GWP | 466 | 675 |
| Efficiency | Similar | High |
| Flammability | A2L | A2L |
| Discharge Temp | Lower | Higher |
Final Thoughts
R454B is quickly becoming the go-to replacement for R410A. If you’re planning a system upgrade, it’s worth serious consideration.
If you need more information about refrigerants or have a refrigeration project in mind, please contact us. Our team of experts is ready to provide you with customized solutions.
FAQ
Can R454B replace R410A?
Yes, but it is not a drop-in replacement. The HVAC system using R-410A refrigerant is not compatible with R-454B refrigerant.
The R-454B system requires a cooling system to reduce refrigerant leakage. You need system cleaning, POE oil, and safety checks.
Does R454B improve energy efficiency?
Yes. In many systems, it delivers slightly better efficiency than R410A.
Is R454B more expensive?
The cost is higher, but it has lower energy use, which can reduce long-term costs.
Is R454B a drop-in replacement?
No. System adjustments are required.
Is R454B safe to use indoors?
Yes, as long as ventilation and installation standards are followed.
What oil does R454B use?
R454B systems typically use POE lubricants.
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