What refrigerator freezer is still mfg. with r-134 a? I purchased a new frigidaire expecting r-134a & it came with r-600.

134a replaced R12 and is typically for car AC units. 600 is not a Freon but is isobutane. Not sure if new units still use 134a.

Do you know if pressures are comparable? I designed my space in the rv for refrigerator with r-134a. Frigidaire claims the model ffet1222qb will work in a garage between 40 degrees and 110 deegrees. Don't know if the are old specs are not. Guess I will have to get extended warranty as I have no experience with r600. From what I can see part of the line set are steel. r600 must not be compatible with copper.

Not sure but 134a, a blend, does have some 600 in it.