Which refrigerants does this P/T tool support?
R-454B (bubble and dew columns), R-32, and R-410A. Tables are a subset of the same PT data used in the A2L Safe Charge app, with linear interpolation between published points.
Browser micro-tool
A2L P/T chart & superheat calculator
Quick R-454B, R-32, and R-410A saturation lookup with superheat and subcooling. R-454B uses dew for superheat and bubble for subcooling — the same glide rule as the offline app.
Superheat
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Saturation temp used
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Point
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Typical band / glide note
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OEM nameplate and charging chart override these typical bands. Verify gauge calibration and system stability before adjusting charge.
- Glide: —
- ASHRAE 34 class: —
- PT source for selected refrigerant: —
PT tables and glide rules are a subset of the A2L Safe Charge app data (NIST REFPROP / National Refrigerants / Hudson Technologies attributions above). Linear interpolation between 5°F table points. This page does not calculate room-based A2L max charge — that lives in the app, structured per UL 60335-2-40 / ASHRAE Standard 15.2.
Reference table
Field-range P/T (−20°F to 130°F)
Displayed slice of the embedded table. Calculations use the full −60°F / −40°F to 150°F dataset shipped in the script.
Common questions
Tool FAQ
How does R-454B glide work in this calculator?
Superheat uses dew-point saturation temperature. Subcooling uses bubble-point saturation temperature. R-32 and R-410A use a single saturation column.
Is this a substitute for the OEM charging procedure?
No. It is an informational estimating aid for qualified technicians. Typical ranges are context only. The OEM nameplate and charging chart override field bands. Room-based A2L max charge is available in the offline A2L Safe Charge app.
Crawlspace has no signal?
Take A2L Safe Charge offline
Same PT math on your phone, plus room-based max charge, history, and PDF job tickets — free on the App Store.
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