HVAC Pressure-Temperature Charts
Verified saturation data for 60 refrigerants — every value sourced and cited. 12 calculators, 21 pair comparisons, 13 long-form guides. No signup, no paywall, CC BY 4.0.
- CoolProp 7.2.0 + 8.0.0
- Validated data
- No signup
- CC BY 4.0
Quick reference — most-used refrigerants at 70°F
Saturation pressure at 70°F. Click any card for the full chart, properties, and retrofit guidance.
R-410A
A1 Lower toxicity, no flame propagationHFC blend201.8PSIG @ 70°FR-22
A1 Lower toxicity, no flame propagationHCFC121.4PSIG @ 70°FR-134a
A1 Lower toxicity, no flame propagationHFC (pure)71.1PSIG @ 70°FR-32
A2L Lower toxicity, lower flammabilityHFC (pure)205.8PSIG @ 70°FR-404A
A1 Lower toxicity, no flame propagationHFC blend149.3PSIG @ 70°FR-454B
A2L Lower toxicity, lower flammabilityHFC/HFO blend190.5 / 183.1PSIG bub/dew @ 70°F
Find a refrigerant
All 60 refrigerants in the dataset. Filter by type, safety class, GWP bucket, or search by name / trade name / chemistry.
60 of 60 refrigerants.
- R-11A1 Lower toxicity, no flame propagation
Trichlorofluoromethane
CFC · GWP 4,750
- R-1150A3 Lower toxicity, higher flammability
Ethylene
Hydrocarbon · GWP 3.7
- R-12A1 Lower toxicity, no flame propagation
Dichlorodifluoromethane
CFC · GWP 10,900
- R-1224yd(Z)A1 Lower toxicity, no flame propagation
(Z)-1-Chloro-2,3,3,3-tetrafluoro-1-propene
HCFO · GWP 1
- R-123B1 Higher toxicity, no flame propagation
2,2-Dichloro-1,1,1-trifluoroethane
HCFC · GWP 77
- R-1233zd(E)A1 Lower toxicity, no flame propagation
(E)-1-Chloro-3,3,3-trifluoro-1-propene
HCFO · GWP 4
- R-1234yfA2L Lower toxicity, lower flammability
2,3,3,3-Tetrafluoropropene
HFO (pure) · GWP 1
- R-1234zeA2L Lower toxicity, lower flammability
1,3,3,3-Tetrafluoropropene (the E isomer is the default unless Z specified)
HFO (pure) · GWP 1
- R-1234ze(E)A2L Lower toxicity, lower flammability
(E)-1,3,3,3-Tetrafluoropropene
HFO (pure) · GWP 1
- R-1234ze(Z)A2L Lower toxicity, lower flammability
(Z)-1,3,3,3-Tetrafluoropropene
HFO (pure) · GWP <1
- R-124A1 Lower toxicity, no flame propagation
1-Chloro-1,2,2,2-tetrafluoroethane
HCFC · GWP 609
- R-125A1 Lower toxicity, no flame propagation
Pentafluoroethane
HFC (pure) · GWP 3,500
- R-1270A3 Lower toxicity, higher flammability
Propylene
Hydrocarbon · GWP 1.8
- R-13A1 Lower toxicity, no flame propagation
Chlorotrifluoromethane
CFC · GWP 14,400
- R-1336mzz(Z)A1 Lower toxicity, no flame propagation
(Z)-1,1,1,4,4,4-Hexafluoro-2-butene
HFO (pure) · GWP 2
- R-134aA1 Lower toxicity, no flame propagation
1,1,1,2-Tetrafluoroethane
HFC (pure) · GWP 1,430
- R-143aA2L Lower toxicity, lower flammability
1,1,1-Trifluoroethane
HFC (pure) · GWP 4,470
- R-152aA2 Lower toxicity, flammable
1,1-Difluoroethane
HFC (pure) · GWP 124
- R-218A1 Lower toxicity, no flame propagation
Octafluoropropane
PFC · GWP 8,830
- R-22A1 Lower toxicity, no flame propagation
Chlorodifluoromethane
HCFC · GWP 1,810
- R-236eaA1 Lower toxicity, no flame propagation
1,1,1,2,3,3-Hexafluoropropane
HFC (pure) · GWP 1,370
- R-236faA1 Lower toxicity, no flame propagation
1,1,1,3,3,3-Hexafluoropropane
HFC (pure) · GWP 9,810
- R-245faB1 Higher toxicity, no flame propagation
1,1,1,3,3-Pentafluoropropane
HFC (pure) · GWP 1,030
- R-290A3 Lower toxicity, higher flammability
Propane
Hydrocarbon · GWP 3.3
- R-32A2L Lower toxicity, lower flammability
Difluoromethane
HFC (pure) · GWP 675
- R-365mfcA2 Lower toxicity, flammable
1,1,1,3,3-Pentafluorobutane
HFC (pure) · GWP 794
- R-404AA1 Lower toxicity, no flame propagation
Ternary HFC blend
HFC blend · GWP 3,922
- R-407AA1 Lower toxicity, no flame propagation
Ternary HFC blend
HFC blend · GWP 2,107
- R-407CA1 Lower toxicity, no flame propagation
Ternary HFC blend
HFC blend · GWP 1,774
- R-407FA1 Lower toxicity, no flame propagation
Ternary HFC blend
HFC blend · GWP 1,825
- R-410AA1 Lower toxicity, no flame propagation
Binary HFC blend
HFC blend · GWP 2,088
- R-417AA1 Lower toxicity, no flame propagation
Ternary HFC blend with isobutane
HFC blend · GWP 2,346
- R-421AA1 Lower toxicity, no flame propagation
Binary HFC blend
HFC blend · GWP 2,631
- R-422AA1 Lower toxicity, no flame propagation
Ternary HFC blend with isobutane
HFC blend · GWP 3,143
- R-422BA1 Lower toxicity, no flame propagation
Ternary HFC blend with isobutane
HFC blend · GWP 2,526
- R-422DA1 Lower toxicity, no flame propagation
Ternary HFC blend with isobutane
HFC blend · GWP 2,729
- R-427AA1 Lower toxicity, no flame propagation
Quaternary HFC blend
HFC blend · GWP 2,138
- R-438AA1 Lower toxicity, no flame propagation
Quinary HFC blend with hydrocarbons
HFC blend · GWP 2,265
- R-448AA1 Lower toxicity, no flame propagation
Five-component HFC/HFO blend
HFC/HFO blend · GWP 1,386
- R-449AA1 Lower toxicity, no flame propagation
Quaternary HFC/HFO blend
HFC/HFO blend · GWP 1,396
- R-450AA1 Lower toxicity, no flame propagation
Binary HFC/HFO blend
HFC/HFO blend · GWP 601
- R-452AA1 Lower toxicity, no flame propagation
Ternary HFC/HFO blend
HFC/HFO blend · GWP 2,140
- R-452BA2L Lower toxicity, lower flammability
Ternary HFC/HFO blend
HFC/HFO blend · GWP 698
- R-454BA2L Lower toxicity, lower flammability
Binary HFC/HFO blend
HFC/HFO blend · GWP 465
- R-454CA2L Lower toxicity, lower flammability
Binary HFC/HFO blend
HFC/HFO blend · GWP 146
- R-455AA2L Lower toxicity, lower flammability
Ternary CO2/HFC/HFO blend
HFC/HFO blend · GWP 146
- R-457AA2L Lower toxicity, lower flammability
Ternary HFC/HFO blend
HFC/HFO blend · GWP 137
- R-500A1 Lower toxicity, no flame propagation
Azeotropic CFC/HFC blend
CFC blend (azeotrope) · GWP 8,077
- R-502A1 Lower toxicity, no flame propagation
Azeotropic HCFC/CFC blend
CFC blend (azeotrope) · GWP 4,657
- R-503A1 Lower toxicity, no flame propagation
Binary HFC/CFC azeotropic blend
CFC blend (azeotrope) · GWP 14,560
- R-507AA1 Lower toxicity, no flame propagation
Binary HFC azeotropic blend
HFC blend · GWP 3,985
- R-513AA1 Lower toxicity, no flame propagation
Binary HFC/HFO blend
HFC/HFO blend · GWP 630
- R-514AB1 Higher toxicity, no flame propagation
Binary HFO/HCO blend
HFO blend · GWP 3
- R-515AA1 Lower toxicity, no flame propagation
Binary HFO/HFC azeotropic blend
HFO blend · GWP 387
- R-515BA1 Lower toxicity, no flame propagation
Binary HFO/HFC azeotropic blend
HFO blend · GWP 287
- R-516AA2L Lower toxicity, lower flammability
Ternary HFO/HFC blend
HFC/HFO blend · GWP 140
- R-600aA3 Lower toxicity, higher flammability
Isobutane (2-methylpropane)
Hydrocarbon · GWP 1
- R-717B2L Higher toxicity, lower flammability
Ammonia
Natural · GWP 1
- R-744A1 Lower toxicity, no flame propagation
Carbon dioxide
Natural · GWP 1
- R-C318A1 Lower toxicity, no flame propagation
Octafluorocyclobutane
PFC · GWP 10,300
All refrigerants A–Z
Every refrigerant PT chart, grouped by chemical family.
HFC (9)
HFC blend (18)
HFO (5)
HFO blend (9)
HCFO (2)
HCFC (3)
CFC (3)
CFC blend (3)
PFC (2)
hydrocarbon (4)
natural (2)
Calculators
12 calculators built on the verified dataset. Bubble vs dew handled automatically for zeotropic blends. Imperial and metric units.
Charging and diagnostic
Superheat
Suction PSIG + line °F → superheat with diagnostic context.
Subcooling
Liquid line PSIG + °F → subcooling with overcharge / undercharge interpretation.
Combined SH / SC / PT
Both sides + pattern-matching diagnostic banner.
System Pressure Diagnostic
8-input expert system: flagged findings with evidence and ordered recommendations.
Refrigerant Charge
Line-set length adjustment to nameplate. Per-foot oz from CoolProp liquid density.
Lookup and reference
Refrigerant comparisons
Direct pair comparisons for the most-asked decisions. 21 pair pages total covering residential, commercial refrigeration, chillers, and naturals.
R-22 vs R-410A
Homeowner replacement decision — why retrofit isn't a simple swap.
R-32 vs R-454B
The two leading R-410A replacements — decided largely by OEM preference.
R-410A vs R-454B
Direct A2L replacement for new equipment installs.
R-22 vs R-32
Legacy HCFC vs modern A2L — full replacement only.
R-134a vs R-513A
Chiller retrofit: 56% GWP reduction, same A1, same POE oil.
R-744 vs R-290
CO₂ transcritical vs propane A3 charge-limited — the natural refrigerant choice.
Refrigerant comparison guide — the framework behind these decisions
Operating pressure references
Typical suction and discharge pressures by ambient temperature, with diagnostic procedure. For field-troubleshooting reference.
- What should R-22 pressures be?
- What should R-410A pressures be?
- What should R-32 pressures be?
- What should R-454B pressures be?
- What should R-134a pressures be?
- What should R-1234yf pressures (mobile A/C) be?
- What should R-449A pressures (Opteon XP40 retrofit) be?
- What should R-407C pressures be?
- What should R-404A pressures be?
- What should R-454C pressures be?
- What should R-744 (CO₂) pressures be?
Long-form guides
Conceptual references for the methods behind the calculators and the decisions behind the comparisons.
Refrigerant Comparison Guide
Framework for choosing between refrigerants across 5 axes — thermo, safety, environment, regulation, practical.
Superheat & Subcooling Fundamentals
What they are, how to measure, target values, the 4 diagnostic patterns.
How to Read a PT Chart
Bubble vs dew, glide, critical point truncation, common pitfalls.
High Head Pressure Causes
Diagnostic decision tree for high-side pressure problems.
About this site
Six guarantees behind every number on every page.
Verified data
Saturation data from CoolProp 7.2.0 (51 fluids) and CoolProp 8.0.0 (6) — both REFPROP-compatible Helmholtz EOS — plus named manufacturer datasheets (2) for blends CoolProp doesn't model.
One source of truth
Every chart, every calculator, every comparison reads from the same validated refrigerant record. No copies, no drift.
Structural safety class
A1 / A2L / A3 / B1 / B2L comes from a typed enum — impossible to mislabel R-32 as A1 even on pages without editorial content yet.
GWP (100-yr)
100-year GWP on the basis US EPA uses (AIM Act exchange values / 40 CFR 84.64(b) / IPCC AR4), with IPCC AR4, AR5 and AR6 shown alongside.
No signup, no paywall
Open access to every chart, calculator, and dataset. Site is ad-supported via Raptive — no email gates, no popups, no required accounts.
Downloadable dataset
Full PT data for every refrigerant available as CSV or JSON under CC BY 4.0. Free for any use with attribution.