The best replacement for r-134a is r-12.

The best alternatives to r-134a are rated as following:
★★★★★  r-12
★★★  r-22
★  r-410a
★  r-123

Your alternative for r-134a is not listed? Suggest!
Speaking about r-134a, one probably shouldn't forget about r-12.

Other search terms related to r-134a and their ratings are:
★★★★★ r-12
You have in mind a companion for r-134a and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of r-134a in all years. Click on graph for more.
r-134a
r-12
r-22