If you’re choosing a refrigerant for the cooling systems, you’ve probably seen systems that use R32 refrigerant. But is it safe, efficient, and worth it in the long run?
In this guide, you’ll learn what R32 refrigerant is, where it’s used, whether it’s the right choice for your system, and which refrigerant can replace it.
What Is R32 Refrigerant?
R32 (difluoromethane) is a widely used refrigerant in modern air conditioning systems. It’s stable, efficient, and does not damage the ozone layer like older refrigerants. R22, a traditional refrigerant containing chlorine, has been phased out.
The single-component refrigerant R32, with its lower GWP (675) and higher energy efficiency, is now one of the main replacements for older refrigerants like R22 and R410A. It meets current environmental rules and allows time for newer, lower-GWP options to develop.
Why Is R32 Becoming Popular?
- Kigali Amendment
- HFC phasedown
- Lower GWP regulations
- 2025 A2L transition
R32 has become one of the mainstream low-GWP solutions in the global residential air conditioning market.
Properties of R32 Refrigerant
Physical Properties of R32 Refrigerant
At standard temperature and pressure, R32 is a colorless, odorless gas that can be liquefied into a transparent liquid under its own pressure. It remains in a liquid state even at high temperatures, so it works well even in high-temperature environments.
At its boiling point, R32 has a latent heat of vaporization as high as 388.4 kJ/kg, which is 3.5% higher than the 375.1 kJ/kg of R410A. An equal mass of R32 can absorb more heat, resulting in higher cooling efficiency. This means your system can cool faster while using less energy.
You can learn more about the physical properties of R32 from the table below:
| Properties | R32 refrigerant |
| Chemical Formula | CH2F2 (Difluoromethane) |
| Type | Single Component HFC Refrigerant |
| Molar Mass | 52.024 g·mol−1 |
| Appearance | Colourless gas |
| Density | 1.1 g cm−3(in liquid form) |
| Melting Point | −136 °C (−213 °F; 137 K) |
| Boiling Point | −52 °C (−62 °F; 221 K) |
| Critical Temperature | 78.4°C |
| Critical Point (T, P) | 351 K (78 °C), 5.83 MPa (57.5 atm) |
| Vapor Pressure | 1,518.92 kPa (at 21.1 °C [70.0 °F; 294.2 K]) |
| GWP | 675 |
| ODP | 0 |
| Safety Classification | A2L |
Chemical Properties of R32 Refrigerant
R32 refrigerant stays stable inside your system. It does not corrode metals like copper or aluminum and works well with standard refrigeration oils. This helps protect your system and keep it running longer.
R32 Pressure Temperature Table
| R32 | ℉ | ℃ |
| 11 | -40 | -40 |
| 14.4 | -35 | 37.2 |
| 18.2 | -30 | 34.4 |
| 22.3 | -25 | 31.7 |
| 26.8 | -20 | -28.9 |
| 31.7 | -15 | -26.1 |
| 37.1 | -10 | -23.3 |
| 42.9 | -5 | -20.6 |
| 49.3 | 0 | -17.8 |
| 56.1 | 5 | -15 |
| 63.5 | 10 | -12.2 |
| 71.5 | 15 | -9.4 |
| 80 | 20 | -6.7 |
| 89.2 | 25 | -3.9 |
| 99.1 | 30 | -1.1 |
| 109.7 | 35 | 1.7 |
| 121 | 40 | 4.4 |
| 133 | 45 | 7.2 |
| 145.9 | 50 | 10 |
| 159.5 | 55 | 12.8 |
| 174.1 | 60 | 15.6 |
| 189.5 | 65 | 18.3 |
| 205.8 | 70 | 21.1 |
| 223.2 | 75 | 23.9 |
| 241.5 | 80 | 26.7 |
| 260.9 | 85 | 29.4 |
| 281.3 | 90 | 32.2 |
| 302.9 | 95 | 35 |
| 325.7 | 100 | 37.8 |
| 349.6 | 105 | 40.6 |
| 374.9 | 110 | 43.3 |
| 401.4 | 115 | 46.1 |
| 429.3 | 120 | 48.9 |
| 458.6 | 125 | 51.7 |
| 489.4 | 130 | 54.4 |
| 521.8 | 135 | 57.2 |
| 555.7 | 140 | 60 |
| 591.4 | 145 | 62.8 |
| 628.8 | 150 | 65.6 |
Advantages of R32 Refrigerant
Environmental Friendliness
R32 refrigerant has an ODP value of 0, meaning it does not deplete the ozone layer at all, thereby completely resolving the ozone hole problem caused by traditional chlorine-containing refrigerants.
Its GWP value is only 675, which is approximately 68% lower than that of R410A. Compared to R22 refrigerant, R32 refrigerant is approximately 63% lower, significantly reducing the carbon footprint of refrigeration equipment and helping you meet modern environmental standards. Equipment using R32 refrigerant is not at risk of being phased out due to environmental policies, so you don’t have to worry about future compliance issues.
High Refrigeration Efficiency
R32 refrigerant offers approximately 10%–15% higher cooling capacity per unit volume than R410A and exhibits superior thermodynamic performance.
Under the same cooling load, R32 refrigeration systems feature lower compressor power consumption and higher heat exchange efficiency, enabling faster cooling and heating speeds while reducing equipment energy consumption.
When using R32 air conditioners and heat pumps, you get faster cooling while lowering your energy bills. This makes it more efficient than older refrigerants like R22.
Strong System Compatibility
As a single-component refrigerant, R32 eliminates the issue of component separation, making charging, recovery, and reclamation operations simple.
Unlike mixed refrigerants, it does not require precise mixing ratios. It is perfectly compatible with all mainstream compressor types, including scroll, rotary, and screw compressors, and offers excellent compatibility with conventional refrigeration system piping, heat exchangers, and refrigeration oil.
If you are an equipment manufacturer, you can complete the refrigerant conversion without major modifications to your production lines. Additionally, R32 refrigeration systems operate at moderate pressures, ensuring high operational stability, low equipment failure rates, and easier maintenance.
Disadvantages of R32 Refrigerant
Flammability
R32 is classified as an A2L-class refrigerant under ASHRAE Standard 34. This means it has kow toxity an lower flammability. While R32 can ignite under its lower flammability limit (LFL) of 0.307 kg/m³, its burning velocity is very low, making it significantly safer than highly flammable refrigerants such as propane (R290)
Combustion will only occur when the concentration in air reaches the flammable range and is exposed to an ignition source such as an open flame or an electric spark. The flame spreads slowly, the combustion intensity is low, and explosions will not occur.
Although the conditions for combustion are stringent, if equipment is not properly sealed or installed, leaks can occur. In enclosed spaces, this may create a flammable environment. If exposed to electrical sparks, open flames, or high-temperature heat sources, ignition can occur if installation or ventilation is poor.
Therefore, R32 equipment has stricter requirements for installation procedures, ventilation conditions, and electrical explosion-proof standards. Installation and maintenance must be performed by qualified professionals. You should always rely on certified technicians for installation and service.
Stringent System Sealing Requirements
R32 refrigerant has a smaller molecular diameter and higher permeability; compared to R410A, it is more prone to leakage through pipe joints and weld seams. This necessitates that the welding and sealing processes for refrigeration system piping meet higher standards.
If construction quality does not meet these standards, slow refrigerant leaks are highly likely to occur, leading to reduced cooling performance and increased maintenance difficulty and costs.
Applications of R32 Refrigerant
You’ll typically find R32 refrigerant used in:
- Residential air conditioners
- Heat pumps
- Multi-split systems
- Small commercial cooling systems
- Refrigerated display cabinets
-
VRF Systems
-
Commercial Split Systems
Is R32 Refrigerant Being Phased Out?
Right now, R32 is still widely used around the world, but a phase-out will begin in the coming years. Existing equipment can continue to operate normally, while new equipment will be replaced with refrigerants that have a lower GWP.
For example, in the European Union, the use of R32 is currently compliant and widely used in residential split-type air conditioners and small heat pumps. However, starting in 2027, R32 refrigerant will only be permitted for after-sales maintenance and will not be allowed in new equipment. After 2030, regulations are tightening, so R32 will eventually be replaced by lower-GWP refrigerants.
If you want to learn more about the use of R32 refrigerant in the EU, click here.
R32 vs R410A
R32 is a half component of R410A, with higher refrigeration capacity and lower charging requirements.
| Property | R32 | R410A |
|---|---|---|
| Refrigerant Type | Single Component | Blend |
| ODP | 0 | 0 |
| GWP | 675 | 2088 |
| Safety Class | A2L | A1 |
| Efficiency | Higher | Lower |
| Charge Amount | Lower | Higher |
Best Alternatives to R32 Refrigerant
Here’s how the main alternatives compare to R32 refrigerant:
R290 (Propane) Natural Refrigerant
R290 is a hydrocarbon-based natural refrigerant and a high-quality alternative to R32. It has an ODP of 0 and a GWP of only 3, making its environmental performance far superior to that of R32. It offers high cooling efficiency, strong molecular stability, low cost, and good compatibility with refrigeration systems. It is currently used in residential air conditioners and small refrigeration equipment.
However, R290 is a Class A3 flammable refrigerant, more flammable than R32, and requires higher standards for system explosion protection and sealing. It is currently mainly used in refrigeration equipment with small charge volumes.
R454B Blended Refrigerant
R454B is a blend of R32 and HFO-type refrigerants, with a GWP as low as 466, offering further improved environmental performance while maintaining an A2L safety classification for low flammability.
Its thermodynamic properties are highly similar to those of R32, offering excellent cooling efficiency. It can be directly integrated into existing R32 refrigeration systems without requiring major equipment modifications, making it a direct upgrade and replacement for R32. It is currently being gradually adopted in mid-to-high-end air conditioning and heat pump equipment.
New HFO-Class Low-GWP Refrigerants
New hydrofluoroolefin (HFO) refrigerants such as HFO-1234yf and HFO-1234ze all have GWP values below 10, exhibit virtually no greenhouse effect, and have an ODP of 0. They represent the future direction for ultra-environmentally friendly refrigerants and serve as long-term alternatives to R32.
These refrigerants are non-flammable, chemically stable, and highly energy-efficient. They are currently used in high-end commercial refrigeration and automotive air conditioning applications.
As technology matures and costs decrease, they will gradually and comprehensively replace R32, becoming the mainstream refrigerants of the next generation. Each option has trade-offs in safety, cost, and efficiency, so the right choice depends on your application.
Conclusion
If you’re in the market for an air conditioner or heat pump, R32 is currently one of the most practical and widely used options on the market. They not only help you save on electricity bills but also contribute to environmental protection.
As industry technology continues to advance, alternatives to R32 will continue to improve, driving the refrigeration industry toward a more environmentally friendly and safer future. If you’re planning a project, choosing the right refrigerant now can help you avoid higher costs and system upgrades in the future.
FAQ
Do I need to obtain a permit through ARC to handle and purchase R32 refrigerant?
If you want to use it in Australia, the answer is yes. Operating systems containing R32 require a Refrigerant Handling License (RHL). The acquisition, possession, and disposal of R32 require a Refrigerant Trading Authorization (RTA).
Which equipment to handle R32 do I need to use?
The equipment is allowed to use A2L or A2 flammable refrigerants.
Where can I buy R32 refrigerant?
R32 can be purchased from most refrigerant wholesalers and fixed air conditioning component suppliers.
Why is R32 being phased out?
Because governments are pushing for refrigerants with even lower global warming impact.
What is the best alternative to R32?
R454B and R290 are the most common options today.
What’s the difference between R32 and R410A?
If you’re comparing options, R32 offers lower GWP and better efficiency than R410A. It also requires less refrigerant charge. However, R32 is mildly flammable, while R410A is not.
Can I replace R410A with R32 directly?
No. R32 is not a direct drop-in replacement for R410A. Systems must be specifically certified for R32 operation. The system needs A2L certification, a specialized compressor, a specialized electronic expansion valve, and specialized security design.
Why is R32 better than R410A?
R32 offers higher energy efficiency, lower refrigerant charge requirements, and a significantly lower GWP than R410A.
You may also find this related blog post very useful:
Which gas is used in air conditioners?
What is refrigerant, the-ultimate-guide?
Types of Refrigerants: The Complete Guide
