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 expensive winter heating. That means it'll eventually pay for itself, like mine did this fall, and with this Black Friday deal, you can reach that point a few months earlier than I did. After that, the extra savings are just money in your pocket. There's no better time to make this p

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