Refrigerant PT Charts

Pressure-temperature saturation tables for 34 refrigerants. Data from NIST thermodynamic library. Built for HVAC technicians.

Popular Refrigerants

R-410A

HFC Blend

A1 GWP 2088
Boiling: -60.6°F
@70°F: 201.7 psig
 LEGACY

R-22

HCFC

A1 GWP 1810
Boiling: -41.5°F
@70°F: 121.4 psig

R-134a

HFC

A1 GWP 1430
Boiling: -14.9°F
@70°F: 71.1 psig
 NEW

R-454B

HFO/HFC Blend

A2L GWP 467
Boiling: -58.9°F
@70°F: 190.5 psig

R-404A

HFC Blend

A1 GWP 3922
Boiling: -51.2°F
@70°F: 149.3 psig

R-407C

HFC Blend

A1 GWP 1774
Boiling: -46.5°F
@70°F: 140.5 psig

R-32

HFC

A2L GWP 675
Boiling: -61.0°F
@70°F: 205.8 psig

R-290 (Propane)

Natural / HC

A3 GWP 3
Boiling: -43.8°F
@70°F: 110.2 psig

R-717 (Ammonia)

Natural

B2L GWP 0
Boiling: -28.0°F
@70°F: 114.1 psig

R-744 (CO₂)

Natural

A1 GWP 1
Boiling: -126.5°F
@70°F: 838.1 psig

R-1234yf

HFO

A2L GWP 4
Boiling: -21.1°F
@70°F: 73.9 psig

R-507A

HFC Blend

A1 GWP 3985
Boiling: -52.1°F
@70°F: 153.0 psig

View all 34 refrigerants →

Browse by type: HFC · HFO & low-GWP blends · Natural · Legacy / phased out · Side-by-side comparisons

R-410A Quick Reference

Temp PSIG PSIA kPa
0°F48.463.13435.3
10°F62.477.13531.8
20°F78.793.36643.7
30°F97.4112.07772.7
35°F107.7122.43844.1
40°F118.8133.49920.4
45°F130.6145.281001.7
50°F143.1157.841088.3
55°F156.5171.211180.4
60°F170.7185.41278.3
65°F185.8200.471382.2
70°F201.7216.431492.2
75°F218.6233.331608.8
80°F236.5251.211732.0
90°F275.3290.031999.7
100°F318.5333.232297.5
110°F366.5381.152627.9
120°F419.5434.172993.5
130°F478.0492.733397.2
140°F542.6557.333842.6
150°F613.9628.594334.0

Full R-410A PT chart →

R-454B — The New Standard

As of January 2025, R-454B is mandatory for all new residential AC and heat pump equipment in the US, replacing R-410A.

  • • 78% lower GWP than R-410A (467 vs 2088)
  • • A2L safety class — mildly flammable, requires updated handling procedures
  • • Similar pressures to R-410A, slightly lower capacity
  • • Existing R-410A systems continue to be serviced with R-410A
R-454B PT Chart R-410A vs R-454B
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PT Calculator
Temp → Pressure lookup
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Superheat Table
Target superheat values

Frequently Asked Questions

What is a PT chart?

A PT chart (pressure-temperature chart) shows the relationship between saturation pressure and temperature for a refrigerant. At any given temperature, the chart tells you the exact pressure at which the refrigerant boils (changes from liquid to vapor). HVAC technicians use PT charts to diagnose system performance and verify proper charge.

What is the pressure of R-410A at 70°F?

R-410A has a saturation pressure of approximately 201.7 PSIG (216.4 PSIA) at 70°F. This is significantly higher than R-22, which operates at about 121.4 PSIG at the same temperature.

What is replacing R-410A?

R-454B is the primary replacement for R-410A in residential AC and heat pump systems. Since January 2025, all new equipment in the US must use R-454B or another approved low-GWP alternative. R-454B has a GWP of 467 compared to R-410A's 2088 — a 78% reduction. Existing R-410A systems can continue to be serviced with R-410A.

What is superheat and subcooling?

Superheat is the temperature of refrigerant vapor above its saturation temperature at a given pressure. It confirms all liquid has evaporated before reaching the compressor. Target: 8-15°F. Subcooling is the temperature below saturation at the condenser outlet, confirming all vapor has condensed. Target: 10-18°F for TXV systems.

Is R-22 still available?

R-22 (Freon) production and import was banned in the US in 2020 under the Clean Air Act. It is only available as reclaimed or recycled refrigerant for servicing existing systems. New equipment has not used R-22 since 2010. The most common replacements are R-407C (retrofit) or R-454B / R-32 (new systems since Jan 2025 under the EPA AIM Act).