There are no drop-in substitutes for R-22.

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Multiple Choice

There are no drop-in substitutes for R-22.

Explanation:
A direct, no-change replacement for R-22 doesn’t exist. A true drop-in would let you swap in another refrigerant and run the same system with the same oil, seals, and hardware, without any modifications. But R-22 systems use mineral oil and have different operating pressures and material compatibility compared to many modern substitutes. Substitutes that are used for retrofit generally require changes—oil type (often from mineral to POE), lubrication adjustments, and sometimes component or seal considerations—to work properly and safely. Because there isn’t a universal, painless swap, the statement is true: there are no drop-in substitutes for R-22.

A direct, no-change replacement for R-22 doesn’t exist. A true drop-in would let you swap in another refrigerant and run the same system with the same oil, seals, and hardware, without any modifications. But R-22 systems use mineral oil and have different operating pressures and material compatibility compared to many modern substitutes. Substitutes that are used for retrofit generally require changes—oil type (often from mineral to POE), lubrication adjustments, and sometimes component or seal considerations—to work properly and safely. Because there isn’t a universal, painless swap, the statement is true: there are no drop-in substitutes for R-22.

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