Google’s Nest Learning Thermostat Slashed My Heating Bill, and It’s $50 Off for Black Friday

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…