R-22 (Freon) Pressure at 135°F — Saturation P-T Data
How This Was Calculated
Saturation pressure interpolated from ASHRAE tabular data for R22. Normal operating pressure range.
- P_sat
- Saturation pressure: 284 PSI
- T_input
- Input temperature: 135°F
- T_data
- ASHRAE tabular reference data: R22
Important Considerations
R-22 (Freon) production ended in 2020 under the Montreal Protocol and EPA regulations. It is banned for use in new equipment since 2010. Existing stocks are recycled/reclaimed only. Prices have risen sharply — plan a system upgrade to R-410A, R-32, or R-454B equipment.
135°F is an extreme operating temperature — above the rated ambient limit for most residential HVAC equipment (typically 115–120°F). At this condition, R22 reaches very high saturation pressure which stresses compressor windings and discharge valves. Most manufacturers void warranty for operation above rated ambient. Consider condenser shading, pre-cooling, or equipment with expanded ambient ratings for installations in direct sun in hot climates.
The saturation pressure shown (for R22 at 135°F) is the baseline for measuring superheat and subcooling. Suction superheat = suction line temperature minus evaporator saturation temperature. Subcooling = condensing saturation temperature minus liquid line temperature. Typical targets: 8–12°F superheat at the evaporator (TXV systems), 10–20°F subcooling at the condenser. Deviations indicate improper charge, metering device issues, or non-condensables.
R-22 is classified A1 (non-toxic, non-flammable). Standard handling practices apply. EPA Section 608 certification is required. Intentional venting is illegal under Section 608 of the Clean Air Act — refrigerant must be recovered before system service or disposal.
R22 has a GWP of 1,810 — meaning 1 lb released equals 1,810 lbs of CO2 equivalent warming over 100 years. It falls under AIM Act HFC phase-down regulations but is considered a transitional refrigerant with lower impact than legacy options like R-22 or R-404A. Lower-GWP alternatives (R-32 at GWP 675, R-454B at GWP 466) are increasingly available for new equipment.
Saturation pressure-temperature data for R22 derived from ASHRAE Fundamentals Handbook, Chapter 30 (Thermophysical Properties of Refrigerants), and verified against manufacturer published data (Chemours Opteon, Honeywell Solstice). Values represent saturated conditions at sea level.