The best replacement for r14 is e17.

The best alternatives to r14 are rated as following:
★★★★★  e17
★★★  r12 insulation
★★★  r12
★★  maya 2013
★  r13
★  royer 101
★  185 60 r14
  185/65 r15
  205 60 r14

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r14
e17
r12 insulation