The Nest 3.0 smart thermostat, which costs $249, offers Alexa compatibility (only the third-generation Nest does). The connection is simple: You can tell Alexa to turn the temperature up or down. But Alexa can also learn. So, you'll be able to say, "Alexa, tell the thermostat that I'm too hot" to get it to turn the temp down. But, for whatever reason, if you don't like Nest, you can always consider Honeywell's smart thermostats, such as the new Lyric T6R, which offers location-based services and geofencing and more fancy features.
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