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Which refrigerant does EPA list as an example of a high-pressure refrigerant?

R-410A is listed with R-22, R-407A, R-407C and R-502.

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  1. R-123
  2. R-410A ✔
  3. R-11

Why: EPA's definition of a high-pressure appliance names R-22, R-407A, R-407C, R-410A and R-502 as examples. R-123 and R-11 are low-pressure refrigerants used in chillers.

Huh, didn't know that: R-22 and R-407A share the high-pressure list, while R-134a belongs to the medium-pressure class.

The dad joke
R-410A walked into a gauge set. It was reading high.
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References

Answer: R-410A. EPA's definition of a high-pressure appliance names R-22, R-407A, R-407C, R-410A and R-502 as examples. R-123 and R-11 are low-pressure refrigerants used in chillers.

  1. 40 CFR 82.152 Definitions (Cornell LII) www.law.cornell.edu/cfr/text/40/82.152
    Examples include but are not limited to appliances using R-22, R-407A, R-407C, R-410A, and R-502.
    Checked 2026-10-10.

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