The best replacement for 15 seer is 13 seer.

The best alternatives to 15 seer are rated as following:
★★★★★  13 seer
★★★★  16 seer
★★★  14 seer
★★★  18 seer
★★★  17 seer
★★  10 seer
★  13 seer heat pump
★  20 seer
★  19 seer
★  12 seer
★  21 seer
  13
  r-22 13 seer
  6 seer
  8 seer

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