The best replacement for nest thermostat is honeywell.

The best alternatives to nest thermostat are rated as following:
★★★★★  honeywell
★★★  ecobee
★  hive

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Speaking about nest thermostat, one probably shouldn't forget about humidity control.

Other search terms related to nest thermostat and their ratings are:
★★★★★ humidity control
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nest thermostat
honeywell
ecobee