The best replacement for r410a is r22.

The best alternatives to r410a are rated as following:
★★★★★  r22
★★★  r134a
★★★  r407c
★★  puron
★★  r22 refrigerant
★  r404a
★  r32
★  r417a
★  freon
★  r22a
  r410
  r-22
  r290
  r22 refrigerants
  puron refrigerant

Your alternative for r410a is not listed? Suggest!
Speaking about r410a, one probably shouldn't forget about r22.

Other search terms related to r410a and their ratings are:
★★★★★ r22
You have in mind a companion for r410a and it is not yet here? Propose!



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r410a
r22
r134a