FieldCalc
A2L superheat & subcooling — field reference

Suction side

Liquid side

Superheat
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Subcooling
—
Evap sat. temp °F
—
Cond sat. temp °F
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Target superheat hint

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Reference only. Verify every reading against the equipment manufacturer's data, your instruments, and your training. This tool is not a substitute for proper gauges, thermometers, or EPA Section 608 certification. A2L refrigerants are mildly flammable — follow all safety procedures, codes, and local regulations.

Data sources

R-454B — saturation tables (bubble & dew point) from Allied Air Enterprises, Refrigerant Piping Guidelines – R454B, Issue 2543 (doc 508822-01), Table 6 “R-454B Refrigerant Pressure-Temperature Chart” (per manufacturer note: saturated vapor temp for superheat, saturated liquid temp for subcooling). Cross-checked against CoolProp 7.2.0 values published at hvacptcharts.com, Senville’s R-454B chart (help.senville.com), and Hudson Technologies’ R-454B PT chart (hudsontech.com PDF).

R-32 — saturation pressure table from the R-32 Refrigerant Pressure Chart (Gas Technologies; per-degree data −70 °C to 70 °C), cross-checked against Chemours’ Pressure and Temperature Guide for Air Conditioning (OPTXLPTAC-2, April 2025) via vifalio.com, and REFPROP-derived R-32 technical data.

Values between published table points are linearly interpolated. Report any discrepancy against a manufacturer chart — wrong PT data used for real charging is a safety issue.