Black Friday Deals: Nest’s fourth-gen smart thermostat looks like a pricey investment, but there’s a lot more to this device than a pretty screen and beveled edges. When this thermostat isn’t on sale, it pays for itself in less than a year — but during Amazon’s Black Friday sale, you can buy one for $230. That represents an 18% discount on the retail price, or $50 in savings.
This smart thermostat’s learning features and eco-friendly suggestions can save you around $20 per month, especially on…

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