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The Ecobee4 has a responsive display, a remote sensor and tons of smart integrations, including a built-in Amazon Alexa speaker. It is unmatched on the market.
The Nest Thermostat E is almost as smart as Nest's other model -- and all for 80 bucks less.
For under $30, this Lux thermostat is programmable and boasts an impressively intuitive interface.