R-410A Pressure Temperature Chart: Printable PDF & Quick Reference

If you charge, troubleshoot, or commission R-410A equipment, the pressure-temperature chart is the single most-used reference on the truck. It tells you the saturation temperature at any given gauge pressure, which is the foundation for measuring superheat at the suction line and subcooling at the liquid line. Get the chart wrong, and every charging decision that follows is wrong with it.

This page gives you the full PT table, a printable version sized for a clipboard or van door, and a clean walkthrough of how to actually use it on a system. For deeper context on operating ranges, our full R-410A Pressure & Temperature Chart technician reference covers high and low side behavior across ambient conditions.

R-410A is a near-azeotropic blend of R-32 and R-125 (50/50). Because the temperature glide is minimal (under 0.3°F), a single column for saturation pressure is accurate enough for field charging work. All pressures below are in PSIG (gauge pressure).

Most techs we talk to keep a laminated copy in the truck and a second one taped inside the equipment cabinet at the shop. A few pointers if you're printing your own:

• Print landscape on letter (8.5 x 11). The two-column format above scales cleanly without losing the temperature increments.
• Laminate it. Refrigerant oil, dust, and sweaty summer hands destroy paper charts in a season.
• Highlight your typical operating range. For residential AC work, that's the 40°F to 50°F suction band and the 100°F to 125°F liquid band. Highlighting those rows speeds up reads on hot rooftops.
• Add your target superheat and subcooling on the back. Most TXV systems aim for 8°F to 12°F subcooling. Fixed-orifice systems use a charging chart based on indoor wet bulb and outdoor dry bulb.

The chart by itself doesn't tell you whether the system is over, under, or correctly charged. It only converts pressure to saturation temperature. The diagnostic value comes from comparing that saturation temperature against the actual line temperature.

For specific operating-range troubleshooting, our breakdown of R-410A high and low side pressures walks through what's normal versus what points to airflow restriction, undercharge, or a failing compressor.

This trips up a lot of newer technicians, so it's worth being precise. At any saturation pressure, refrigerant exists as a mixture of liquid and vapor at the same temperature. That's the saturation temperature - the temperature at which the phase change is happening.

Refrigerant enters as a low-pressure liquid-vapor mix and leaves as a slightly superheated vapor. Anywhere along that coil where liquid still exists, the temperature equals the saturation temperature for the suction pressure. Once the last droplet boils off, the vapor starts gaining sensible heat, and that's your superheat region.

Refrigerant enters as a high-pressure superheated vapor, gives up heat, and condenses. Anywhere along that coil where vapor still exists, the temperature equals the saturation temperature for the discharge pressure. Once it's fully condensed, additional cooling drops it below saturation - that's your subcooling region.

This is where the chart earns its keep. Two short formulas, applied correctly, tell you almost everything about a system's charge state.

• Low superheat (under 5°F): Risk of liquid floodback to the compressor. Often indicates overcharge or a stuck-open metering device.
• High superheat (over 20°F): Evaporator is starving for refrigerant. Points to undercharge, a restriction, or a failed TXV.
• Low subcooling (under 5°F): Not enough liquid in the condenser. Usually undercharge or non-condensables in the system.
• High subcooling (over 15°F): Too much liquid backing up in the condenser. Typically overcharge or condenser airflow restriction.

For a deeper look at how these numbers shift across ambient temperature ranges, see our reference on R-410A operating pressures.

If you're servicing R-410A systems in 2026, you've already noticed the price pressure. Wholesale R-410A is running roughly $16 to $20 per pound, with installed costs in the $50 to $90 per pound range depending on market. EPA virgin refrigerant allowances were cut materially for 2026, and prices are expected to keep climbing as supply shifts toward reclaimed product.

The flip side: equipment legally manufactured before January 1, 2025 can still be installed. AC Direct is sitting on overstock R-410A inventory at attractive pricing while supplies last - useful when a homeowner needs a same-week replacement and the A2L equivalent is back-ordered, or when matching an existing R-410A indoor coil makes more economic sense than a full system swap. Browse our R-410A air conditioning system overstock for current availability.

About 201 PSIG. This is a useful indoor-ambient reference point, since a properly recovered or shut-down system sitting at 70°F should show roughly 201 PSIG on both gauges. A significant deviation suggests refrigerant loss or contamination.

On a system running in cooling mode at typical conditions, suction pressure usually falls between 102 and 145 PSIG, which corresponds to a 35°F to 50°F saturation temperature in the evaporator. The exact target depends on indoor return air temperature and humidity. For comparison against high-side readings, see our high and low side pressure chart.

For TXV systems, target subcooling typically runs 8°F to 12°F per the manufacturer's data plate. Superheat on TXV systems should land between 10°F and 15°F. Fixed-orifice (piston) systems use a manufacturer charging chart based on indoor wet bulb and outdoor dry bulb temperatures rather than a fixed superheat target.

No. Each refrigerant has its own pressure-temperature relationship. R-454B operates at meaningfully lower pressures than R-410A at the same saturation temperature, and R-32 operates closer to R-410A but is not identical. Always use the chart printed for the refrigerant you're charging - cross-using charts is a common cause of misdiagnosed charge issues and damaged equipment.

Yes, with conditions. The EPA's AIM Act stopped manufacturing of new R-410A residential equipment as of January 1, 2025, and an installation deadline was originally set for December 31, 2025. The EPA has since deprioritized enforcement of that installation deadline, meaning legally manufactured pre-2025 R-410A equipment can still be installed without penalty in 2026 while a formal rule change is finalized. Service refrigerant remains legal indefinitely.

Industry estimates put reliable R-410A service availability at 10 years or more, with some projections reaching 2036. Once virgin allocations dry up, servicing will rely on reclaimed and recycled refrigerant - the same model R-22 followed during its phase-out. Existing systems do not need to be replaced.