The Nest has been gaining popularity for quite some time, by getting close to its users—and learning exactly how they like to keep those homes heated and cooled. Announced late last year, the second-gen Nest is 20 percent slimmer than its predecessor and boasts compatibility with 95 percent of low-voltage residential heating and cooling systems. It also offers two-stage cooling, three-stage heating, and emergency heat for heat pumps, as well as whole-home humidifiers and dehumidifiers. The upgrade included version 3.0 software, which offers a System Match feature and Early On options to get your house just the way you want it, when you want it. Oh, and if you’re not exactly sure how you want it, there are iOS and Android apps for endless temperature tweaks.

MSRP: $229
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