Refrigerant P-T Chart
Saturation pressure-temperature lookup reconciled against manufacturer P-T charts for the common refrigerants, with clear flags on rows still awaiting reconciliation
Free refrigerant P-T chart for HVAC technicians, refrigeration mechanics, and service engineers. The app covers saturation rows for R-410A, R-22, R-134a, R-404A, R-407C, R-32, R-290, R-1234yf, R-454B, R-513A, R-448A, R-449A, and R-744 (CO2). Rows for R-410A, R-22, R-32, R-454B, R-407C, R-134a, R-404A, and R-290 are reconciled against archived manufacturer P-T charts (Chemours and Daikin/Weitron) with truth-library validation anchors; R-448A, R-449A, R-513A, R-1234yf, and R-744 remain flagged in-app as display rows until manufacturer reconciliation is completed. The chart shows R-407C bubble/dew columns and flags zeotropic rows such as R-454B, R-448A, and R-449A where the app only has a single-column local row.
Calculate measured superheat and subcooling from gauge readings
Superheat & Subcooling Calculator →Check psychrometric properties before load or condensation decisions
Psychrometric Calculator →How It Works
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Select a Refrigerant
Choose one of the 13 local display rows. Read the data-quality note for the selected row before relying on any pressure, temperature, GWP, ODP, safety-class, or transition context.
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Choose the Lookup Mode
Use Pressure-to-Temperature, Temperature-to-Pressure, or Table mode. Inputs outside the local row range are clamped and flagged instead of treated as verified extrapolated property data.
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Review Source Warnings
Check the source warnings, residual gaps, and source pointers. For zeotropic blends, verify current manufacturer bubble/dew guidance before superheat, subcooling, charging, or diagnostic use.
Built For
- HVAC service technicians cross-checking a P-T value against the current manufacturer chart
- Refrigeration mechanics documenting whether a row needs bubble/dew, A2L, R-22, or CO2 review before measurements are used
- Engineers and estimators comparing local operating-pressure context while keeping replacement and retrofit approval outside the tool
- Instructors and apprentices learning why source basis, interpolation, and blend glide matter before field reliance
- Owners preparing better questions for a qualified HVAC or manufacturer review
References
- National Refrigerants R-410A product data and thermodynamic tables source pointer
- Arkema Forane R-410A thermodynamic properties source pointer citing NIST REFPROP 9.0
- ASHRAE Handbook Fundamentals Chapters 29 and 30 source pointers for refrigerant and property-table context
- ASHRAE Standards 15/34 public source pointers for safety-class and refrigeration-system context
- EPA Section 608, SNAP, and AIM Act source pointers for regulated refrigerant review boundaries
Frequently Asked Questions
Learn More
Refrigerant Numbers Explained
How the R-number system works, plus where local GWP, ODP, glide, safety-class, SNAP, SDS, and equipment-review limits apply.
Reading Refrigerant P-T Prompts: Source Boundaries, Bubble, Dew, and Glide
How to read pressure-temperature saturation prompts with source boundaries, R-410A validation anchors, bubble/dew caveats, measurement limits, and refrigerant review warnings.
How Line Set Length Affects Refrigerant Charge
Why line-set charge adjustments require exact manufacturer manuals, EPA Section 608 practices, A2L review, and qualified HVAC checks.
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