ASE A7 Practice Questions - ASE A7 Heating And Air Conditioning Certification Exam

Which refrigerant has been the industry standard for automotive A/C systems since the mid-1990s?

R-12 (CFC-12) R-134a (HFC-134a) R-1234yf (HFO-1234yf) R-22 (HCFC-22)

Correct Answer:

R-134a (HFC-134a)

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