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R-410A PT Chart

Saturation pressure for R-410A from -38°F to 150°F, with liquid (bubble) and vapor (dew) columns. Look up a pressure or temperature, switch to metric, and check typical operating pressures.

By BrazeJobs Team · Updated

R-410A Lookup

Liquid (Bubble)

118.8 psig

Vapor (Dew)

118.4 psig

Bubble Point

39.6°F

Dew Point

39.8°F

Chart range: -38°F to 150°F. Enter vacuum as a negative pressure. Check R-410A superheat and subcooling

R-410A PT Chart

TempLiquid (Bubble)Vapor (Dew)
-38°F12.1 psig12.0 psig
-36°F13.4 psig13.3 psig
-34°F14.8 psig14.7 psig
-32°F16.3 psig16.2 psig
-30°F17.8 psig17.7 psig
-28°F19.4 psig19.3 psig
-26°F21.0 psig20.9 psig
-24°F22.7 psig22.6 psig
-22°F24.5 psig24.4 psig
-20°F26.3 psig26.2 psig
-18°F28.2 psig28.1 psig
-16°F30.2 psig30.0 psig
-14°F32.2 psig32.0 psig
-12°F34.3 psig34.1 psig
-10°F36.5 psig36.3 psig
-8°F38.7 psig38.5 psig
-6°F41.0 psig40.8 psig
-4°F43.4 psig43.2 psig
-2°F45.9 psig45.7 psig
0°F48.4 psig48.2 psig
2°F51.1 psig50.8 psig
4°F53.8 psig53.5 psig
6°F56.6 psig56.3 psig
8°F59.5 psig59.2 psig
10°F62.4 psig62.2 psig
12°F65.5 psig65.2 psig
14°F68.6 psig68.4 psig
16°F71.9 psig71.6 psig
18°F75.2 psig74.9 psig
20°F78.7 psig78.4 psig
22°F82.2 psig81.9 psig
24°F85.8 psig85.5 psig
26°F89.6 psig89.2 psig
28°F93.4 psig93.1 psig
30°F97.4 psig97.0 psig
32°F101.4 psig101.1 psig
34°F105.6 psig105.2 psig
36°F109.9 psig109.5 psig
38°F114.3 psig113.9 psig
40°F118.8 psig118.4 psig
42°F123.4 psig123.0 psig
44°F128.2 psig127.7 psig
46°F133.0 psig132.6 psig
48°F138.0 psig137.5 psig
50°F143.2 psig142.6 psig
52°F148.4 psig147.9 psig
54°F153.8 psig153.2 psig
56°F159.3 psig158.7 psig
58°F164.9 psig164.4 psig
60°F170.7 psig170.1 psig
62°F176.7 psig176.0 psig
64°F182.7 psig182.1 psig
66°F188.9 psig188.3 psig
68°F195.3 psig194.6 psig
70°F201.8 psig201.1 psig
72°F208.4 psig207.7 psig
74°F215.2 psig214.5 psig
76°F222.2 psig221.4 psig
78°F229.3 psig228.5 psig
80°F236.5 psig235.8 psig
82°F244.0 psig243.2 psig
84°F251.6 psig250.7 psig
86°F259.3 psig258.5 psig
88°F267.3 psig266.4 psig
90°F275.4 psig274.5 psig
92°F283.6 psig282.7 psig
94°F292.1 psig291.2 psig
96°F300.7 psig299.8 psig
98°F309.5 psig308.6 psig
100°F318.6 psig317.6 psig
105°F341.9 psig340.9 psig
110°F366.4 psig365.4 psig
115°F392.3 psig391.2 psig
120°F419.4 psig418.3 psig
125°F447.9 psig446.8 psig
130°F477.9 psig476.8 psig
135°F509.4 psig508.3 psig
140°F542.5 psig541.4 psig
145°F577.3 psig576.3 psig
150°F613.9 psig613.0 psig

About R-410A

R-410A is an HFC blend of R-32 and R-125 that replaced R-22 in US residential and light commercial AC and heat pumps. It contains no chlorine, so it does not deplete ozone, but its global warming potential is high.

It is a near-azeotropic blend: the glide is a fraction of a degree, so liquid and vapor pressures are almost the same. R-410A runs at about 70% higher pressure than R-22, so its gauges, hoses and components are rated for the higher pressure.

  • Residential split AC and heat pumps built from the 2000s through 2024
  • Ductless mini-splits and packaged units
  • Light commercial rooftop units and VRF systems

R-410A Properties

Key facts for identifying R-410A and choosing tools, oil and replacements.

Boiling point and critical temperature: Hudson Technologies. GWP: IPCC AR4 values, the basis of EPA’s AIM Act rules. Safety class: ASHRAE Standard 34.
PropertyValue
TypeHFC
CompositionR-32 50%, R-125 50% by weight
ASHRAE safety classA1
GWP (IPCC AR4)2,088
Boiling point at 1 atm-61°F
Critical temperature158.3°F
OilPOE (polyolester)
Trade namesPuron, Genetron AZ-20, Suva 410A, Forane 410A
ReplacesR-22
Replaced byR-454B, R-32

Typical R-410A Operating Pressures

Suction pressure is the vapor (dew) pressure at the evaporator temperature; head pressure is the liquid (bubble) pressure at the condensing temperature. The temperatures are common design points, not charging targets.

Calculated from the chart on this page. Real pressures move with load, airflow, ambient temperature and charge.
ConditionEvaporatorSuctionCondensingHead
AC cooling, 95°F outdoor40°F118.4 psig115°F392.3 psig

How to Read the R-410A PT Chart

The chart covers -38°F to 150°F. Pressures are gauge pressure (psig), the number your manifold shows; switch to °C and kPa above if you work in metric.

R-410A is a zeotropic blend, so it boils over a range of temperatures instead of at one point. That range is the glide. The liquid (bubble) column gives the pressure where the first bubble forms; the vapor (dew) column gives the pressure where the last drop of liquid boils off.

At 40°F, the bubble pressure is 118.8 psig and the dew pressure is 118.4 psig. Read the other way, at 118.4 psig the glide is about 0.2°F.

Use the vapor (dew) column for superheat on the suction line and the liquid (bubble) column for subcooling on the liquid line. Mixing them up shifts the answer by the glide.

Superheat and Subcooling Formulas

The PT chart turns a gauge pressure into a saturation temperature. Compare that with a line temperature to get superheat or subcooling.

Superheat

SH = Tsuction − Tdew

Subcooling

SC = Tbubble − Tliquid

Vacuum

inHg = −psig × 2.036

Metric

°C = (°F − 32) × 5/9, kPa = psig × 6.895

Tsuction
Suction line temperature near the outdoor unit or compressor, °F
Tliquid
Liquid line temperature leaving the condenser, °F
Tdew
Dew point at suction pressure (vapor column), °F
Tbubble
Bubble point at liquid pressure (liquid column), °F

Gauge pressure (psig) is pressure above atmospheric. Below 0 psig, the chart shows vacuum in inches of mercury.

Worked Example: R-410A Superheat and Subcooling

AC cooling, 95°F outdoor: an R-410A system reads 118.4 psig suction with a 50°F suction line, and 392.3 psig on the liquid line with a 105°F liquid line.

  1. Dew point at 118.4 psig: 40.0°F.
  2. Superheat: 50°F − 40.0°F = 10.0°F.
  3. Bubble point at 392.3 psig: 115.0°F.
  4. Subcooling: 115.0°F − 105°F = 10.0°F.

Result: 10.0°F superheat and 10.0°F subcooling. Compare them with the manufacturer’s targets before adding or recovering refrigerant.

Is R-410A Being Phased Out?

Under EPA’s AIM Act Technology Transitions rule, new residential and light commercial AC and heat pumps moved to refrigerants with a GWP under 700 starting January 1, 2025. That is why new equipment now ships with R-454B or R-32.

Existing R-410A systems can be serviced for their full life, and R-410A stays available for service. A 2026 EPA rule also removed the federal installation deadline for qualifying residential systems built from older components.

R-410A Field Tips

Practical points for working on R-410A systems, from the sources below.

  1. 1

    Use R-410A rated gauges and hoses

    R-410A runs much higher than R-22. Low side readings near 120 psig and high side readings near 400 psig are normal on a hot day, so use a manifold, hoses and recovery cylinders rated for R-410A pressures.

  2. 2

    Charge it as liquid

    Even with almost no glide, R-410A is a blend. Charge from the liquid side of the cylinder and meter it in through the manifold so the mix in the system stays right.

  3. 3

    Keep the oil dry

    POE oil absorbs moisture from the air. Keep the system sealed, replace the filter drier when you open it, and pull a deep vacuum before charging.

Sources: ABC: EPA’s removal of the R-410A installation deadline, Greenheck: A2L refrigerants after the 2025 EPA transition, ACHR News: Charging refrigeration systems with blended refrigerants

Frequently Asked Questions

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