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R-32 Pressure Temperature Chart
Interactive PT chart for R-32. A low-GWP R-410A alternative used in mini-splits and inverter systems. R-32 is A2L mildly flammable — pressures are close to R-410A but slightly higher. Pre-loaded for field use.
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R-32 Saturation Data
20 data points| Temperature | Pressure (psig) |
|---|---|
| -40°F | 7.8 |
| -30°F | 14 |
| -20°F | 21.8 |
| -10°F | 31.3 |
| 0°F | 42.7 |
| 10°F | 56.3 |
| 20°F | 72.3 |
| 30°F | 91 |
| 40°F | 112.6 |
| 50°F | 137.5 |
| 60°F | 166 |
| 70°F | 198.4 |
| 80°F | 235.2 |
| 90°F | 276.6 |
| 100°F | 323.3 |
| 110°F | 375.8 |
| 120°F | 434.7 |
| 130°F | 500.5 |
| 140°F | 574.1 |
| 150°F | 656.1 |
Source: ASHRAE Fundamentals. Pressures are gauge (psig) at sea level. Negative values indicate vacuum conditions.
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R-32 Pressure Reference Values
R-32 (difluoromethane, HFC-32) is a pure refrigerant — not a blend. It is one of the two components of R-410A (R-32 and R-125). Used alone, R-32 has a GWP of 675 versus R-410A at 2,088, making it attractive as a lower-GWP refrigerant for new equipment.
| Temperature | R-32 (psig) | R-410A (psig) |
|---|---|---|
| 0°F / -18°C | 58 | 48 |
| 20°F / -7°C | 88 | 75 |
| 40°F / 4°C | 132 | 115 |
| 70°F / 21°C | 222 | 195 |
| 100°F / 38°C | 349 | 307 |
| 110°F / 43°C | 420 | 376 |
Approximate values. Use the interactive tool above for precise readings. Source: ASHRAE Fundamentals.
Key Facts About R-32
R-32 has a Global Warming Potential (GWP) of 675 — compared to R-410A at 2,088. This is a 68% reduction in GWP, making it a significant improvement for climate impact while maintaining similar system efficiency.
R-32 is classified as A2L (mildly flammable) under ASHRAE 34. It has a Lower Flammability Limit (LFL) of approximately 14.4% by volume in air — much higher than propane or isobutane, which means it is significantly harder to ignite.
At 40°F, R-32 saturates at approximately 132 psig — about 15% higher than R-410A (115 psig) at the same temperature. This means R-410A-rated components may not cover the full R-32 pressure range at elevated temperatures.
R-32 requires POE (polyolester) oil as the compressor lubricant, the same as R-410A equipment. It is not compatible with mineral oil.
R-32 is the sole refrigerant in Daikin's Bluevolution product line and is widely used in Mitsubishi Electric, Fujitsu, and other mini-split systems sold globally.
R-32 PT Chart — Frequently Asked Questions
What are the normal operating pressures for R-32?
R-32 saturation pressures are close to R-410A but slightly higher at elevated temperatures. At 40°F, R-32 saturates at approximately 132 psig — about 15% higher than R-410A at 115 psig. At 110°F (condenser), R-32 is roughly 400 psig versus R-410A at 376 psig. Technicians transitioning from R-410A service will find the pressure ranges familiar, but should verify tools and hoses are rated for R-32 service.
Is R-32 flammable?
R-32 is classified as A2L — mildly flammable. It has a narrow flammability range, a high ignition energy requirement, and burns slowly. In real-world conditions, ignition of R-32 requires a concentrated mix in an enclosed space plus a substantial ignition source. It is not explosive. However, EPA regulations and equipment manufacturers require specific safety protocols: ventilated work areas, no open flames, and leak detection equipment when working with A2L refrigerants. Technicians must have training specifically covering A2L refrigerant handling.
Is R-32 replacing R-410A?
R-32 is one of the main R-410A replacements, particularly in mini-split systems from Asian manufacturers like Daikin, Mitsubishi, and others. In the United States, R-454B is more common for new ducted residential systems. Both have significantly lower GWP than R-410A (R-32 at GWP 675, R-454B at GWP 466, versus R-410A at GWP 2,088). Equipment must be specifically designed for R-32 — it cannot be used as a drop-in replacement for R-410A.
Can I use R-410A tools on R-32 systems?
Many R-410A service tools are compatible with R-32 due to their similar operating pressures, but you should verify compatibility before use. Key points: manifold gauges rated for R-410A pressures are generally suitable for R-32 pressure ranges; refrigerant-specific hoses should be checked for compatibility with R-32; recovery machines must be rated for A2L refrigerants or dedicated to R-32 service. Never mix R-32 and R-410A in the same cylinder or system — they are not the same refrigerant.
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