HVAC PT Charts

How our PT charts are calculated and checked

Every saturation table on this site is computed from a published equation of state, except three blends — R-438A, R-448A and R-503 — whose tables are transcribed from the manufacturer’s data sheet. For 11 refrigerants we also compare the table with an independent published source: NIST reference data or the refrigerant maker’s own pressure-temperature chart.

How the tables are calculated

The 1°F pressure-temperature tables are computed from published equations of state, not transcribed by hand. Each fluid’s table is generated once and stored; the pages interpolate it linearly (and invert it for temperature-at-pressure lookups).

Gauge pressure is one standard atmosphere below absolute: psig = psia − 14.6959 psi. For zeotropic blends the table carries two columns — the bubble (saturated-liquid) pressure and the dew (saturated-vapor) pressure; for pure refrigerants and azeotropes the two coincide and the table shows a single column. Pressures are displayed to 0.1 psi (sub-atmospheric pressures as inches of mercury vacuum); the SI column is rounded to the nearest kPa.

51 refrigerants are computed with CoolProp 7.2.0. The 6 chiller and high-temperature heat-pump refrigerants (R-1224yd(Z), R-1336mzz(Z), R-450A, R-514A, R-515A, R-515B) are computed with CoolProp 8.0.0. The 3 datasheet-native blends (R-438A, R-448A, R-503) are transcribed at the manufacturer’s native resolution from the published PT table rather than computed.

Where CoolProp’s standard saturation solver does not converge, we compute the point by following the saturation curve in small steps from the nearest temperature where it does (a flash calculation with initial guesses). Wherever both methods work, they agree to within 0.001 psi. Points computed this way:

FluidHow its PT table is computed
R-11CoolProp 7.2.0
R-1150CoolProp 7.2.0
R-12CoolProp 7.2.0
R-1224yd(Z)Computed with CoolProp 8.0.0
R-123CoolProp 7.2.0
R-1233zd(E)CoolProp 7.2.0
R-1234yfCoolProp 7.2.0
R-1234zeCoolProp 7.2.0
R-1234ze(E)CoolProp 7.2.0
R-1234ze(Z)CoolProp 7.2.0
R-124CoolProp 7.2.0
R-125CoolProp 7.2.0
R-1270CoolProp 7.2.0
R-13CoolProp 7.2.0
R-1336mzz(Z)Computed with CoolProp 8.0.0
R-134aCoolProp 7.2.0
R-143aCoolProp 7.2.0
R-152aCoolProp 7.2.0
R-218CoolProp 7.2.0
R-22CoolProp 7.2.0
R-236eaCoolProp 7.2.0
R-236faCoolProp 7.2.0
R-245faCoolProp 7.2.0
R-290CoolProp 7.2.0
R-32CoolProp 7.2.0
R-365mfcCoolProp 7.2.0
R-404ACoolProp 7.2.0 mixture model: R-143a/R-125/R-134a, 52/44/4% by mass
R-407ACoolProp 7.2.0 mixture model: R-32/R-125/R-134a, 20/40/40% by mass
R-407CCoolProp 7.2.0 mixture model: R-32/R-125/R-134a, 23/25/52% by mass
R-407FCoolProp 7.2.0 mixture model: R-32/R-125/R-134a, 30/30/40% by mass
R-410ACoolProp 7.2.0 mixture model: R-32/R-125, 50/50% by mass
R-417ACoolProp 7.2.0 mixture model: R-125/R-134a/R-600, 46.6/50/3.4% by mass
R-421ACoolProp 7.2.0 mixture model: R-125/R-134a, 58/42% by mass
R-422ACoolProp 7.2.0 mixture model: R-125/R-134a/R-600a, 85.1/11.5/3.4% by mass
R-422BCoolProp 7.2.0 mixture model: R-125/R-134a/R-600a, 55/42/3% by mass
R-422DCoolProp 7.2.0 mixture model: R-125/R-134a/R-600a, 65.1/31.5/3.4% by mass
R-427ACoolProp 7.2.0 mixture model: R-32/R-125/R-143a/R-134a, 15/25/10/50% by mass
R-438ADuPont ISCEON® MO99™ (R-438A) Pressure-Temperature Chart, Publication K-22220-1 (September 2009). Same table reproduced as Appendix B of the Chemours Freon™ MO99 Refrigerant Retrofit Guidelines, Publication C-10862 (August 2016).
R-448AHoneywell Solstice® N40 (R-448A) Technical Data Sheet (Publication 3820, September 2019), pressure-temperature table, page 2
R-449ACoolProp 7.2.0 mixture model: R-32/R-125/R-1234yf/R-134a, 24.3/24.7/25.3/25.7% by mass
R-450AComputed with CoolProp 8.0.0
R-452ACoolProp 7.2.0 mixture model: R-32/R-125/R-1234yf, 11/59/30% by mass
R-452BCoolProp 7.2.0 mixture model: R-32/R-1234yf/R-125, 67/26/7% by mass
R-454BCoolProp 7.2.0 mixture model: R-32/R-1234yf, 68.9/31.1% by mass — 135–150°F added 2026-10-01
R-454CCoolProp 7.2.0 mixture model: R-32/R-1234yf, 21.5/78.5% by mass
R-455ACoolProp 7.2.0 mixture model: R-744/R-32/R-1234yf, 3/21.5/75.5% by mass
R-457ACoolProp 7.2.0 mixture model: R-32/R-152a/R-1234yf, 18/12/70% by mass
R-500CoolProp 7.2.0 mixture model: R-12/R-152a, 73.8/26.2% by mass
R-502CoolProp 7.2.0 mixture model: R-22/R-115, 48.8/51.2% by mass
R-503Historical refrigerant — retired per Montreal Protocol (CFC-13 component banned)
R-507ACoolProp 7.2.0 mixture model: R-125/R-143a, 50/50% by mass
R-513ACoolProp 7.2.0 mixture model: R-134a/R-1234yf, 44/56% by mass
R-514AComputed with CoolProp 8.0.0
R-515AComputed with CoolProp 8.0.0
R-515BComputed with CoolProp 8.0.0
R-516ACoolProp 7.2.0 mixture model: R-1234yf/R-134a/R-152a, 77.5/8.5/14% by mass
R-600aCoolProp 7.2.0
R-717CoolProp 7.2.0
R-744CoolProp 7.2.0
R-C318CoolProp 7.2.0

Equation-of-state and mixture-model references

The CoolProp 8.0.0 fluids carry explicit equation-of-state and mixture-model citations in the dataset:

  • R-1224yd(Z)
    • EOS — R-1224yd(Z): Akasaka, R.; Lemmon, E. W. A Helmholtz Energy Equation of State for cis-1-Chloro-2,3,3,3-tetrafluoro-1-propene [R-1224yd(Z)]. Int. J. Thermophys. 44, 166 (2023). doi:10.1007/s10765-023-03266-3
  • R-1336mzz(Z)
    • EOS — R-1336mzz(Z): McLinden, M. O.; Akasaka, R. Thermodynamic Properties of cis-1,1,1,4,4,4-Hexafluorobutene [R-1336mzz(Z)]: Vapor Pressure, (p, rho, T) Behavior, and Speed of Sound Measurements and Equation of State. J. Chem. Eng. Data 65, 4201-4214 (2020). doi:10.1021/acs.jced.9b01198
  • R-450A
    • EOS — R-134a: Tillner-Roth, R.; Baehr, H. D. An International Standard Formulation for the Thermodynamic Properties of 1,1,1,2-Tetrafluoroethane (HFC-134a) for Temperatures from 170 K to 455 K and Pressures up to 70 MPa. J. Phys. Chem. Ref. Data 23, 657-729 (1994). doi:10.1063/1.555958
    • EOS — R-1234ze(E): Thol, M.; Lemmon, E. W. Equation of State for the Thermodynamic Properties of trans-1,3,3,3-Tetrafluoropropene [R-1234ze(E)]. Int. J. Thermophys. 37, 28 (2016). doi:10.1007/s10765-016-2040-6
    • Mixture model — R-134a/R-1234ze(E): Bell, I. H. Mixture Models for Refrigerants R-1234yf/134a, R-1234yf/1234ze(E), and R-134a/1234ze(E) and Interim Models for R-125/1234yf, R-1234ze(E)/227ea, and R-1234yf/152a. J. Phys. Chem. Ref. Data 51, 013103 (2022). doi:10.1063/5.0086060
  • R-514A
    • EOS — R-1336mzz(Z): McLinden, M. O.; Akasaka, R. Thermodynamic Properties of cis-1,1,1,4,4,4-Hexafluorobutene [R-1336mzz(Z)]: Vapor Pressure, (p, rho, T) Behavior, and Speed of Sound Measurements and Equation of State. J. Chem. Eng. Data 65, 4201-4214 (2020). doi:10.1021/acs.jced.9b01198
    • EOS — R-1130(E): Huber, M. L.; Kazakov, A. F.; Lemmon, E. W. Equation of State for the Thermodynamic Properties of trans-1,2-Dichloroethene [R-1130(E)]. Int. J. Thermophys. 46, 76 (2025). doi:10.1007/s10765-025-03535-3
    • Mixture model — R-1336mzz(Z)/R-1130(E): McLinden, M. O. et al. Refrigerant Properties Development R&D: Final Report to the U.S. Department of Energy. NIST IR 8570 (2025). doi:10.6028/NIST.IR.8570
  • R-515A
    • EOS — R-1234ze(E): Thol, M.; Lemmon, E. W. Equation of State for the Thermodynamic Properties of trans-1,3,3,3-Tetrafluoropropene [R-1234ze(E)]. Int. J. Thermophys. 37, 28 (2016). doi:10.1007/s10765-016-2040-6
    • EOS — R-227ea: Lemmon, E. W.; Span, R. Thermodynamic Properties of R-227ea, R-365mfc, R-115, and R-13I1. J. Chem. Eng. Data. doi:10.1021/acs.jced.5b00684
    • Mixture model — R-1234ze(E)/R-227ea: Bell, I. H. Mixture Model for Refrigerant Pairs R-32/1234yf, R-32/1234ze(E), R-1234ze(E)/227ea, R-1234yf/152a, and R-125/1234yf. J. Phys. Chem. Ref. Data 52, 013101 (2023). doi:10.1063/5.0135368
  • R-515B
    • EOS — R-1234ze(E): Thol, M.; Lemmon, E. W. Equation of State for the Thermodynamic Properties of trans-1,3,3,3-Tetrafluoropropene [R-1234ze(E)]. Int. J. Thermophys. 37, 28 (2016). doi:10.1007/s10765-016-2040-6
    • EOS — R-227ea: Lemmon, E. W.; Span, R. Thermodynamic Properties of R-227ea, R-365mfc, R-115, and R-13I1. J. Chem. Eng. Data. doi:10.1021/acs.jced.5b00684
    • Mixture model — R-1234ze(E)/R-227ea: Bell, I. H. Mixture Model for Refrigerant Pairs R-32/1234yf, R-32/1234ze(E), R-1234ze(E)/227ea, R-1234yf/152a, and R-125/1234yf. J. Phys. Chem. Ref. Data 52, 013101 (2023). doi:10.1063/5.0135368

How we check them

For 11 refrigerants we transcribed points from an independent published source and compare them with the values shown on the page every time the site is updated. If any point differs by more than the tolerance in the table below, the update is not published. For the 51 refrigerants computed with CoolProp 7.2.0, every row is also recomputed by a separate script and compared with the published value before each update.

FluidChecked againstPointsRangeLargest difference
R-1234YFChemours Opteon™ YF thermodynamic properties tables11−40°F to 150°F0.01 psi
R-134ANIST Chemistry WebBook (SRD 69) saturation data for R-134a20−38°F to 148°F0.01 psi
R-22NIST Chemistry WebBook (SRD 69) saturation data for R-2219−39°F to 136°F0.01 psi
R-290NIST Chemistry WebBook (SRD 69) saturation data for propane (R-290)18−30°F to 134°F0.01 psi
R-32NIST Chemistry WebBook (SRD 69) saturation data for R-3220−29°F to 110°F0.01 psi
R-404AArkema Forane® 404A pressure-temperature chart The chart states it was generated with NIST REFPROP 9.0.40−40°F to 150°F0.05 psi
R-407CArkema Forane® 407C pressure-temperature chart The chart states it was generated with NIST REFPROP 9.0.55−40°F to 150°F0.05 psi
R-410AArkema Forane® 410A pressure-temperature chart The chart states it was generated with NIST REFPROP 9.0.64−40°F to 150°F0.06 psi
R-454BHoneywell Solstice® 454B pressure-temperature chart12100 to 520 psig0.39°F
R-454CHoneywell Solstice® 454C pressure-temperature chart280 to 400 psig0.05°F
R-513AChemours Opteon™ XP10 pressure-temperature chart340 to 260 psig0.36°F

Not yet checked against an independent source

The remaining 49 fluids are computed exactly as above but have not yet been cross-checked against an independent published source:

R-11, R-1150, R-12, R-1224yd(Z), R-123, R-1233zd(E), R-1234ze, R-1234ze(E), R-1234ze(Z), R-124, R-125, R-1270, R-13, R-1336mzz(Z), R-143a, R-152a, R-218, R-236ea, R-236fa, R-245fa, R-365mfc, R-407A, R-407F, R-417A, R-421A, R-422A, R-422B, R-422D, R-427A, R-438A, R-448A, R-449A, R-450A, R-452A, R-452B, R-455A, R-457A, R-500, R-502, R-503, R-507A, R-514A, R-515A, R-515B, R-516A, R-600a, R-717, R-744, R-C318.

Corrections

  • October 2, 2026 — R-407C, 131–138°F (and 55–59°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 0.5 psi. They are now computed directly.
  • October 2, 2026 — R-407F, 119–139°F (and 48–59°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 3.0 psi. They are now computed directly.
  • October 2, 2026 — R-410A, 107–113°F (and 42–45°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 0.4 psi. They are now computed directly.
  • October 2, 2026 — R-422A, 143–149°F (and 62–65°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 0.5 psi. They are now computed directly.
  • October 2, 2026 — R-452B, 128–145°F (and 53–63°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 2.8 psi. They are now computed directly.
  • October 2, 2026 — R-507A, 128–135°F (and 53–57°C): these rows had been interpolated between neighboring rows instead of computed; the largest error was 0.5 psi. They are now computed directly. The dropped 149–150°F rows were also added.