The best replacement for 18 seer is 13 seer.

The best alternatives to 18 seer are rated as following:
★★★★★  13 seer
★★★★★  16 seer
★★★  14 seer
★★  15 seer
★★  10 seer
★  20 seer
  21 seer
  12 seer

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18 seer
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