The best replacement for carrier infinity is lennox signature.

The best alternatives to carrier infinity are rated as following:
★★★★★  lennox signature
★★★  trane xl19i
★★★  bryant evolution
★★★  lennox elite
★★  trane xl16i
★★  york affinity
★  trane 16i
★  trane xl20i
★  trane xv95

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Speaking about carrier infinity, one probably shouldn't forget about nest.

Other search terms related to carrier infinity and their ratings are:
★★★★★ nest
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lennox signature
trane xl19i