The best replacement for 10 seer is 13 seer.

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

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

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