While searching for a refrigerant for a new air conditioning system, heat pump, or HVAC project, you’ve probably come across R32 refrigerant and R290 refrigerant. These variants are considered lower-impact alternatives to older refrigerants such as R410A, as they differ significantly in efficiency, flammability, environmental impact, and application requirements.
What Is R32 Refrigerant?
Chemically, R32 is known as difluoromethane (CH₂F₂), R32 is a hydrofluorocarbon (HFC) refrigerant. It has become one of the most widely adopted replacements for R410A because it offers lower environmental impact and maintains strong cooling performance.
Key Properties of R32 Refrigerant
Commonly, you will find R32 in residential split air conditioners, VRF systems, commercial HVAC installations and air-to-air heat pumps. Using R32 offers you the following properties:
- ASHRAE Safety Classification: A2L (mildly flammable)
- Global Warming Potential (GWP): 675
- Ozone Depletion Potential (ODP): 0
- Single-component refrigerant with no temperature glide
- High volumetric cooling capacity
- Strong performance in modern inverter-driven systems
One key advantage you may notice about R32 is that it is a single-component refrigerant, which simplifies charging and servicing when compared to blended refrigerants.
What Is R290 Refrigerant?
R290 refrigerant is simply high-purity propane used as a refrigerant. Unlike R32, it is classified as a natural refrigerant and has become increasingly popular in heat pumps, refrigeration systems, and low-carbon HVAC applications.
Key Properties of R290 Refrigerant
You will most commonly see R290 used in air-to-water heat pumps, commercial refrigeration equipment, display refrigerators, cold rooms and monobloc HVAC systems. Using R290 will offer you the following properties:
- ASHRAE Safety Classification: A3 (highly flammable)
- GWP: 3
- ODP: 0
- Excellent thermodynamic efficiency
- Lower operating pressures than R32
- Strong heating and cooling performance
The biggest trade-off is that R290’s higher flammability requires stricter safety controls and charge-size limitations.
R32 vs R290 Refrigerant Comparison: Key Technical Differences
R32 vs R290 Refrigerant GWP Comparison
If environmental impact is one of your primary concerns, this is where you’ll see the biggest difference. While R32 significantly reduces environmental impact compared to R410A, R290’s GWP of just 3 makes it one of the most environmentally friendly refrigerants currently available.
| Refrigerant | GWP |
| R290 | 3 |
| R32 | 675 |
| R410A | 2,088 |
Moreover, both these refrigerants have zero ozone depletion potential.
R32 vs R290 Refrigerant Efficiency Comparison
When you compare efficiency, both refrigerants perform extremely well, but their strengths differ slightly. Using R32 offers high cooling capacity and excellent volumetric efficiency while R290 gives you heating performance and energy efficiency.
When you are comparing heat pump performance, numerous manufacturers report SCOP values above 4.8 for R290 systems, while R32 systems typically achieve SCOP values between 4.4 and 4.6. It depends on the operating conditions and system design. This means you may see greater seasonal heating efficiency from R290 in certain applications, particularly in colder regions.
R32 vs R290 Refrigerant Pressure Temperature Chart Analysis
Another important difference you will notice is operating pressure. R32 generally operates at higher pressures, typically in the range of 12–26 bar whereas R290 operates at lower pressures, typically around 6–12 bar.
Lower operating pressure can reduce mechanical stress on components, while R32’s higher volumetric capacity allows manufacturers to design more compact systems.
When servicing either refrigerant, you should always use a manufacturer-approved R32 vs R290 pressure temperature chart because operating pressures vary significantly between the two refrigerants.
R32 vs R290 Refrigerant Performance Comparison
While evaluating overall HVAC performance, you will find that both refrigerants deliver excellent results. R32 generally provides a higher volumetric cooling capacity, smaller compressor requirements along with strong cooling performance in air conditioning systems.
R290 typically provides excellent heating efficiency, better high-temperature water production along with strong performance in air-to-water heat pumps. Also it provides reduced energy consumption in some heating applications.
R32 vs R290 Discharge Temperature Comparison
Discharge temperature affects compressor reliability and lubricant performance. R32 generally operates with higher discharge temperatures due to its higher operating pressures. This can require additional attention to compressor cooling and oil management. On the other hand, R290 often operates with lower discharge temperatures, which may contribute to improved compressor longevity under certain conditions.
R32 vs R290 Flammable Refrigerant Comparison
Safety Classification and Standards
If safety is one of your main concerns, it’s important to understand the classifications.
- R32: A2L (mildly flammable)
- R290: A3 (highly flammable)
These classifications are defined by:
- ASHRAE Standard 34
- ISO 817
- IEC 60335-2-40
- EN 378 safety standards
R32 vs R290 Safety Comparison
Generally from an installation perspective, R32 is generally easier to accommodate due to its lower flammability classification. To use R290, you will have to consider advanced leak prevention measures, better ventilation, management of the ignition source and regulatory charge-size limits.
Note: This might imply that R290 is unsafe, it’s not. The installation standards for modern equipment are stringent and incorporate multiple safety systems.
R32 vs R290 Charge Size Comparison
Charge size restrictions are another major difference. Typical residential systems may contain:
- R32: 1.5–3.5 kg
- R290: 0.5–1.5 kg
Since R290 is classified as A3, international standards impose stricter charge limitations to manage flammability risks.
R32 vs R290 for Air Conditioning
If you are selecting a refrigerant for residential or commercial air conditioning, R32 currently remains the dominant choice because it offers proven global adoption, strong cooling performance and moderate safety requirements. It is also compatible with existing HVAC manufacturing platforms that’s why many leading air conditioner manufacturers continue to standardize around R32.
R32 vs R290 for Heat Pumps
Many manufacturers are increasingly adopting R290 because it offers ultra-low GWP, excellent heating efficiency along with higher hot water temperatures (70–75°C). While evaluating refrigerants for modern heat pumps, R290 has a strong alignment with future decarbonization goals. Although R32 heat pumps remain extremely popular, R290 is gaining momentum in next-generation heating systems.
R32 vs R290 vs R410A
| Feature | R32 | R290 | R410A |
| GWP | 675 | 3 | 2,088 |
| ODP | 0 | 0 | 0 |
| Safety Class | A2L | A3 | A1 |
| Efficiency | High | Very High | Moderate |
| Operating Pressure | High | Moderate | High |
| Future Regulatory Outlook | Transitional | Strong | Phase-out |
Difference Between R32 and R290 (Quick Comparison Table)
| Feature | R32 | R290 |
| Refrigerant Type | HFC | Natural Hydrocarbon |
| Chemical Formula | CH₂F₂ | C₃H₈ |
| GWP | 675 | 3 |
| ODP | 0 | 0 |
| ASHRAE Classification | A2L | A3 |
| Flammability | Mildly Flammable | Highly Flammable |
| Operating Pressure | Higher | Lower |
| Typical Charge Size | Larger | Smaller |
| Air Conditioning Use | Excellent | Limited |
| Heat Pump Use | Excellent | Excellent |
| Environmental Impact | Low | Very Low |
Frequently Asked Questions
R32 vs R290: Which Is Better?
Neither refrigerant is universally better. The right choice depends on your priorities, whether that’s efficiency, environmental impact, safety, regulatory compliance, or equipment design.
Is R290 More Environmentally Friendly Than R32?
Yes. R290 has a GWP of only 3 compared to R32’s GWP of 675, making it one of the most environmentally friendly refrigerants available.
Which Refrigerant Is Safer?
R32 is generally considered safer from a flammability standpoint because it is classified as A2L rather than A3.
Can R290 Replace R32?
No. These refrigerants are not direct replacements for one another. Equipment must be specifically designed and certified for the refrigerant being used.
Which Refrigerant Is Better for Heat Pumps?
R290 is increasingly favored in high-efficiency heat pumps due to its low GWP and excellent heating performance, although R32 remains widely used.
Conclusion
When you compare R32 vs R290, you will find that both refrigerants offer significant advantages over older options such as R410A. Instead of focusing on a single “best” refrigerant, you should evaluate your application, safety requirements, efficiency goals, and regulatory considerations to see which option is the right fit for your HVAC or heat pump system.
You may also find this related blog post very useful:
What is refrigerant? The ultimate guide.
Which gas is used in air conditioners?
About The Author
Evan Wang
I am Evan Wang, the General Manager, Marketing Director, and SEO Expert at Sunnyda Cold Room. I have over 20 years of experience in the refrigeration industry, and my expertise is in commercial refrigeration solutions.
I’d be delighted to share practical ideas about refrigeration products, project selection, export trade, SEO, and marketing.
Let’s connect!
