Black Friday Deal: Nest's fourth-gen smart thermostat isn't cheap, but there's a lot of power packed behind the slick screen and beveled edges. Even at full price, the Nest Learning Thermostat pays for itself in about a year, but you can now snag one for just $230 during Amazon's Black Friday sale . That's an 18% discount off 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. See at Amazon for $230

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