R-744 is an acceptable substitute for both R-12 and R-134a in a refrigerant system retrofit.

Name: R-744 is an acceptable substitute for both R-12 and R-134a in a refrigerant system retrofit.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

R-744 (carbon dioxide, CO2) has different thermodynamic and physical properties compared to R-12 and R-134a, making it not a direct drop-in substitute for these refrigerants in existing systems without significant modifications.

R-744 Is an Acceptable Substitute for Both R-12 and R-134a