The best replacement for 13 seer is 14 seer.

The best alternatives to 13 seer are rated as following:
★★★★★  14 seer
★★★★★  16 seer
★★★★  15 seer
★★  10 seer
★★  18 seer
★  19 seer
★  14.5 seer
★  21 seer
★  17 seer
★  16 seer air conditioner
★  14
  20 seer
  8 seer
  12 seer
  15 seer heat pump
  14 see

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Speaking about 13 seer, one probably shouldn't forget about 10 seer.

Other search terms related to 13 seer and their ratings are:
★★★★★ 10 seer
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