# R-410A PT Chart (Pressure-Temperature)

An R-410A PT chart gives the saturation pressure of R-410A at each temperature. R-410A is a near-azeotropic blend, so its liquid and vapor pressures differ by less than 1 psi and its glide is about 0.2°F. At 40°F it saturates at about 118.4 psig; at 100°F, about 318.5 psig.

## Key takeaways

- R-410A is a 50/50 blend (by mass) of R-32 and R-125, classed A1 (lower toxicity, nonflammable).
- It's near-azeotropic: glide is only about 0.2°F, so one column is close enough for field work. The chart still shows both for precision.
- It runs about 63% higher pressure than R-22 at 100°F (318.5 vs 195.9 psig). Never use R-22 gauges, hoses or charts on it.
- EPA lists its GWP at 2,090, above the 700 GWP limit for new residential split systems built from components made after 2024.
- Pre-2025 R-410A inventory can still be installed since July 27, 2026, and existing systems can still be repaired.

## What are normal R-410A pressures at 40°F and 100°F?

At a 40°F saturation temperature, typical of a cooling-mode evaporator, R-410A sits at 118.4 psig. At a 100°F condensing temperature it's 318.5 psig. Those are saturation pressures, not targets: what a running system shows depends on indoor load, airflow and outdoor temperature, so you judge charge by superheat or subcooling against the manufacturer's chart.

**R-410A next to the refrigerants techs see beside it (psig, from this site's CoolProp tables)**

| Saturation temp | R-410A (dew) | R-32 | R-454B (dew) | R-22 |
| --- | --- | --- | --- | --- |
| 0°F | 48.2 | 49.3 | 42.9 | 24.0 |
| 40°F | 118.4 | 121.0 | 107.5 | 68.6 |
| 100°F | 317.6 | 325.7 | 291.9 | 195.9 |

_R-32 runs a few psi above R-410A (121.0 vs 118.4 at 40°F); R-454B runs lower (107.5 dew). Each chart is its own refrigerant, so match the nameplate._

## Does R-410A have glide? Bubble vs. dew

Barely. R-410A's two components, R-32 and R-125, boil at almost the same temperature at a given pressure, so the blend acts nearly like a single refrigerant. In this table the bubble-to-dew gap is about 0.2°F at 118 psig and 0.2°F at 340 psig; in pressure terms it's 0.9 psi at 100°F (318.5 bubble, 317.6 dew). Daikin's published chart shows the same split (318.6 liquid, 317.6 vapor).

> **Why the column barely matters on R-410A (illustrative readings)**
>
> Suction 118 psig, suction line 50°F. Dew point: 39.8°F, so superheat is **10.2°F**.
>
> Read the bubble column by mistake and you get 39.6°F and 10.4°F of superheat. A 0.2°F difference, compared with about 2.7°F on R-454B.
>
> Liquid side: 340 psig is a bubble point of 104.6°F. With a 95°F liquid line, subcooling is **9.6°F**. Try your own numbers in the [superheat calculator](https://www.brix.so/tools/superheat-calculator) or the [subcooling calculator](https://www.brix.so/tools/subcooling-calculator).

Even with small glide, R-410A is still a blend. Charge it as liquid unless the manufacturer says otherwise, so the mix going into the system stays at 50/50.

## Is R-410A being phased out?

R-410A is being phased down, not banned outright. The [AIM Act](https://www.epa.gov/climate-hfcs-reduction/hfc-allowance-allocation-and-reporting) has EPA cut U.S. HFC production and consumption by 85% by 2036 through allowances, which shrinks the supply of R-410A over time. Separately, EPA's Technology Transitions rules set a 700 GWP limit for new residential and light commercial AC and heat pump systems, and [EPA lists R-410A's GWP at 2,090](https://www.epa.gov/snap/substitutes-residential-and-light-commercial-air-conditioning-and-heat-pumps).

- **New systems from current production:** components made or imported on or after January 1, 2025 can't go in as a new R-410A system. They use an A2L like [R-454B](https://www.brix.so/reference/refrigerant-pt-chart/r-454b) or [R-32](https://www.brix.so/reference/refrigerant-pt-chart/r-32) instead.
- **Pre-2025 inventory:** EPA's final rule effective July 27, 2026 removed the January 1, 2026 installation deadline for systems whose specified components were all made or imported before January 1, 2025. Details, dates and the pending court petitions are in [our news post on the R-410A deadline change](https://www.brix.so/news/epa-r-410a-installation-deadline-change).
- **Repairs:** [EPA's FAQ](https://www.epa.gov/hfcs/frequent-questions-phasedown-hydrofluorocarbons) says existing systems can keep being serviced, including replacing a major component like a condensing unit or compressor.
- **Self-contained products** such as window units follow a different schedule on [EPA's sector table](https://www.epa.gov/hfcs/technology-transitions-hfc-restrictions-sector).

> **Verify against the manufacturer's installation instructions**
>
> This is a saturation table, not a charging chart. Target superheat, target subcooling and total charge come from the unit's own installation instructions, which take precedence over any generic chart.

## How this table was made and checked

We compute every row with [CoolProp](https://coolprop.org) 8.0.0 (HEOS backend) as an R-32/R-125 mixture at 50/50% by mass, then convert to gauge pressure relative to 14.696 psia. Our automated test compares 20 temperatures from −30°F to 150°F against the [Daikin A1 vs. A2L chart](https://www.chadwellsupply.com/globalassets/articles-pk/a2l/a2lptc-usa_04-24.pdf) (liquid and vapor columns, all within 0.1 psi) and 10 temperatures against the [Arkema Forane wall chart](https://forane.arkema.com/files/live/sites/fluorogases_forane_arkema/files/downloads/literature/general-forane-literature/forane-wall-chart-americas.pdf), which was generated with NIST REFPROP. At 0°F the table reads 48.4 psig liquid and 48.2 psig vapor; both published charts print 48.4 liquid.

### Related

- [All refrigerant PT charts](https://www.brix.so/reference/refrigerant-pt-chart): R-410A, R-454B, R-32 and R-22 side by side.
- [Refrigerant PT calculator](https://www.brix.so/tools/refrigerant-pt-calculator): Pressure to temperature for any of the four.
- [R-410A installation deadline change](https://www.brix.so/news/epa-r-410a-installation-deadline-change): What the May 2026 EPA rule did.
- [Superheat and subcooling lesson](https://www.brix.so/academy/hvac/refrigeration/superheat-subcooling): How to use a PT chart to check a charge.

## Frequently asked questions

### What should R-410A pressure be at 40°F?

About 118.4 psig (vapor) and 118.8 psig (liquid) at a 40°F saturation temperature. That's what a cooling coil boiling at 40°F would read on the suction gauge at sea level. Whether that's right for the unit depends on load and airflow, so check superheat or subcooling against the manufacturer's chart.

### Is R-410A a blend or a pure refrigerant?

It's a blend of R-32 and R-125, 50/50 by mass. It's near-azeotropic, with about 0.2°F of glide, so it behaves almost like a single refrigerant. It should still be charged as liquid so the composition doesn't shift.

### Can I still buy and install R-410A in 2026?

R-410A refrigerant is still sold for servicing, though the AIM Act phasedown is shrinking supply. Since July 27, 2026, new R-410A split systems can be installed if every specified component was made or imported before January 1, 2025. Systems built from 2025-or-later components need a refrigerant under 700 GWP.

### Can I put R-454B or R-32 in an R-410A system?

No. Both are A2L (mildly flammable) refrigerants approved for new equipment designed for them, and their pressures differ from R-410A. Use the refrigerant on the nameplate and never mix refrigerants in a system.

### Why is R-410A pressure so much higher than R-22?

R-410A has a higher vapor pressure at the same temperature: 318.5 psig at 100°F against 195.9 psig for R-22, about 63% higher. That's why R-410A equipment, gauges, hoses and recovery cylinders are rated for higher pressure.

### Which column do I use on an R-410A chart?

Technically dew (vapor) for superheat and bubble (liquid) for subcooling, like any blend. On R-410A the difference is only about 0.2°F, which is why many older R-410A charts print one column.

## Related

- [Refrigerant PT Charts (Pressure-Temperature)](https://www.brix.so/reference/refrigerant-pt-chart)
- [R-454B PT Chart (Pressure-Temperature)](https://www.brix.so/reference/refrigerant-pt-chart/r-454b)
- [R-32 PT Chart (Pressure-Temperature)](https://www.brix.so/reference/refrigerant-pt-chart/r-32)
- [R-22 PT Chart (Pressure-Temperature)](https://www.brix.so/reference/refrigerant-pt-chart/r-22)
- [Refrigerant PT Calculator (Pressure ↔ Temperature)](https://www.brix.so/tools/refrigerant-pt-calculator)
- [Superheat Calculator](https://www.brix.so/tools/superheat-calculator)
- [Subcooling Calculator](https://www.brix.so/tools/subcooling-calculator)
- [EPA Removes the January 1, 2026 R-410A Installation Deadline: What Contractors Need to Know](https://www.brix.so/news/epa-r-410a-installation-deadline-change)
- [Superheat and Subcooling, Explained with Worked Examples](https://www.brix.so/academy/hvac/refrigeration/superheat-subcooling)
- [HVAC Software That Answers the Phone, Books the Tech and Keeps the Books](https://www.brix.so/for/hvac)

## Sources

- [CoolProp 8.0.0: thermophysical property library (HEOS backend), used to compute this table](https://coolprop.org/coolprop/HighLevelAPI.html) (checked 2026-10-24)
- [Daikin Comfort Technologies: A1 vs. A2L Pressure Temperature Chart, USA (PM-A2LPTC-USA_04-24)](https://www.chadwellsupply.com/globalassets/articles-pk/a2l/a2lptc-usa_04-24.pdf) (checked 2026-10-24)
- [Arkema Forane: refrigerant pressure-temperature wall chart, Americas (2019, NIST REFPROP 9.0)](https://forane.arkema.com/files/live/sites/fluorogases_forane_arkema/files/downloads/literature/general-forane-literature/forane-wall-chart-americas.pdf) (checked 2026-10-24)
- [U.S. EPA SNAP: Substitutes in residential and light commercial AC and heat pumps (R-410A GWP 2,090)](https://www.epa.gov/snap/substitutes-residential-and-light-commercial-air-conditioning-and-heat-pumps) (checked 2026-10-24)
- [U.S. EPA: HFC allowance allocation and reporting (AIM Act, 85% phasedown by 2036)](https://www.epa.gov/climate-hfcs-reduction/hfc-allowance-allocation-and-reporting) (checked 2026-10-24)
- [U.S. EPA: Frequent questions on the phasedown of HFCs (repairs to existing systems)](https://www.epa.gov/hfcs/frequent-questions-phasedown-hydrofluorocarbons) (checked 2026-10-24)
- [U.S. EPA: Technology Transitions HFC restrictions by sector](https://www.epa.gov/hfcs/technology-transitions-hfc-restrictions-sector) (checked 2026-10-24)

Last verified against [CoolProp 8.0.0 (computed 2026-10-24), cross-checked against the Daikin A1 vs. A2L PT chart (04-24) and the Arkema Forane wall chart (2019)](https://www.chadwellsupply.com/globalassets/articles-pk/a2l/a2lptc-usa_04-24.pdf) on 2026-10-24.

Talk to BRIX: call or text (518) 588-1122, email eeharris2004@gmail.com, or book a 15-minute call at https://cal.com/ethanharris/15min.

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Written by BRIX Editorial Team. Last updated 2026-10-24.
Canonical: https://www.brix.so/reference/refrigerant-pt-chart/r-410a