SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/epa-no-drop-in

Can any new refrigerant simply be swapped in as a 'drop-in' replacement with no changes?

No. There are no true drop-in replacements.

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  1. Yes, if the pressures are similar
  2. Yes, if the label says drop-in
  3. No, EPA says there are no true drop-in replacements ✔

Why: EPA's test topics include the absence of drop-in replacements. Substitute refrigerants can be incompatible with the oils and parts used with older refrigerants, so a retrofit needs to be planned.

Huh, didn't know that: EPA notes hydrocarbons are not approved for retrofits.

The dad joke
There is no such thing as a drop-in. Anything that drops in still needs paperwork.
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References

Answer: No, EPA says there are no true drop-in replacements. EPA's test topics include the absence of drop-in replacements. Substitute refrigerants can be incompatible with the oils and parts used with older refrigerants, so a retrofit needs to be planned.

  1. Section 608 Technician Certification Test Topics, US EPA www.epa.gov/section608/section-608-technician-certification-test-topics
    Absence of "drop-in" replacements
    Checked 2026-10-10.

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