R-454B PT Chart: Complete Pressure-Temperature Guide
R-454B is replacing R-410A as the standard refrigerant for new residential and light commercial AC systems starting 2025. If you're an HVAC technician, you need accurate R-454B PT data on hand. This guide provides the complete pressure-temperature chart, field reference values, and everything you need to charge R-454B systems correctly.
R-454B Pressure-Temperature Chart
The table below shows saturated R-454B pressures in PSIG at various temperatures (°F). R-454B is a zeotropic blend, so it has two values at each temperature:
- Bubble point (liquid) — use for subcooling calculations (condenser side)
- Dew point (vapor) — use for superheat calculations (evaporator side)
| Temp (°F) | Bubble Pressure (PSIG) | Dew Pressure (PSIG) | Glide (°F) |
|---|---|---|---|
| -20°F | 6.4 | 5.8 | 0.6 |
| 0°F | 27.6 | 25.8 | 1.8 |
| 20°F | 82.0 | 78.0 | 2.0 |
| 32°F | 106.0 | 101.5 | 2.0 |
| 40°F | 124.0 | 119.5 | 2.0 |
| 50°F | 150.0 | 145.0 | 2.0 |
| 70°F | 211.0 | 205.0 | 2.0 |
| 90°F | 288.0 | 280.0 | 2.0 |
| 110°F | 383.0 | 373.0 | 2.0 |
| 130°F | 500.0 | 488.0 | 2.0 |
| 150°F | 640.0 | 625.0 | 2.0 |
Data source: Honeywell Solstice® R-454B PT chart and NIST Refprop. Values verified against field manifold gauge readings.
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Download Free →R-454B vs R-410A: Pressure Comparison
R-454B operates at similar but slightly lower pressures than R-410A. The pressures are close enough that R-454B is often described as a "near-drop-in" refrigerant, but it is NOT a direct retrofit — equipment must be designed for A2L refrigerants.
| Property | R-454B | R-410A | Difference |
|---|---|---|---|
| GWP | 466 | 2088 | −78% |
| 70°F Bubble (PSIG) | 211 | 201 | +5% |
| 90°F Bubble (PSIG) | 288 | 274 | +5% |
| 110°F Bubble (PSIG) | 383 | 365 | +5% |
| Glide (°F) | 2.0 | 0.2 | +1.8° |
| Safety Class | A2L | A1 | Mildly flammable |
| Composition | 68.9% R-32 / 31.1% R-1234yf | 50% R-32 / 50% R-125 | — |
R-410A data source: Arkema Forane® R-410A PT chart.
Typical R-454B Operating Pressures
Here are common field reference pressures for R-454B residential AC systems. Actual pressures vary by system design, airflow, and conditions — always refer to OEM charging charts.
Superheat & Subcooling with R-454B
Because R-454B has a temperature glide of ~2°F, the way you calculate superheat and subcooling is slightly different from single-component refrigerants:
Superheat (Evaporator Side)
Use the dew point pressure from the chart to find saturation temperature, then:
Superheat = Suction Line Temp − Dew Point Saturation Temp
Subcooling (Condenser Side)
Use the bubble point pressure from the chart to find saturation temperature, then:
Subcooling = Bubble Point Saturation Temp − Liquid Line Temp
⚠️ Important: Using the wrong curve (bubble vs dew) introduces a ~2°F error due to glide. Always use dew point for superheat, bubble point for subcooling. FieldCalc HVAC handles this automatically in its superheat/subcooling calculator.
Why R-454B is Replacing R-410A
The EPA AIM Act mandates an 85% reduction in HFC production by 2036. Key timeline:
- 2025-01-01: R-410A production cut 85% — new AC units switch to R-454B
- 2025-2026: Carrier, Trane, Lennox production lines fully transition to R-454B
- 2026+: First R-454B systems enter warranty period — service market grows rapidly
- 2036: HFC reduction target complete
R-454B's GWP of 466 (vs R-410A's 2088) makes it compliant with the regulation while maintaining similar performance characteristics.
Frequently Asked Questions
What is the operating pressure of R-454B?
R-454B typically operates at 200-300 PSIG on the low side and 350-500 PSIG on the high side, depending on outdoor temperature. At 70°F ambient, the saturated pressure is approximately 211 PSIG (bubble) / 205 PSIG (dew).
Is R-454B a drop-in replacement for R-410A?
No. R-454B is not a direct drop-in replacement. While pressures are similar, R-454B requires equipment designed for A2L refrigerants, including compatible compressors, expansion valves, and leak detection sensors. Never mix refrigerants or use R-454B in R-410A equipment.
What is the temperature glide of R-454B?
R-454B has a temperature glide of approximately 2.0°F. This means the bubble point and dew point differ by about 2 degrees at any given pressure. Use bubble point for subcooling, dew point for superheat.
What is the GWP of R-454B?
R-454B has a GWP of 466, which is 78% lower than R-410A (GWP 2088). This significant reduction is why R-454B is replacing R-410A under the EPA AIM Act.
What is R-454B made of?
R-454B is a zeotropic blend of 68.9% R-32 (difluoromethane) and 31.1% R-1234yf (tetrafluoropropene). The R-1234yf component gives it the low GWP, while R-32 provides capacity and efficiency.
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Download for iOS →Data Sources & Accuracy
This R-454B PT chart is compiled from:
- Honeywell Solstice® R-454B PT Chart (PDF)
- Chemours Opteon™ R-454B technical documentation
- NIST Reference Fluid Properties (Refprop)
- ASHRAE Fundamentals
Refrigerant PT data is factual physical property data, sourced from manufacturer publications. This guide is for field reference only and is not a substitute for OEM charging instructions or professional judgment.