R-410A PT Chart (Pressure-Temperature)

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.

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).

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 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.

• 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 or 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.
• Repairs: EPA's FAQ 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.

How this table was made and checked

We compute every row with CoolProp 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 (liquid and vapor columns, all within 0.1 psi) and 10 temperatures against the Arkema Forane wall chart, 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.