NEW: Google Nest Learning Thermostat (4th Gen) with Nest Temperature Sensor (2nd Gen) - Energy Saving Smart Thermostat with Adaptive Eco - Works with Alexa and Google Home App - Polished Obsidian (Color Black) About this itemNest’s smartest, most advanced thermostat yet, the Google Nest Learning Thermostat (4th gen) is a beautiful, brilliant way to save energy, keep your home comfortable, and help make sure your heating and cooling systems are running smoothlyThe Nest Learning Thermostat (4th gen) works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes; visit the Nest Compatibility Checker for more infoIt comes with the Nest Temperature Sensor (2nd gen) and works with any Nest Temperature Sensor; put a sensor in any room to help manage hot and cold spots, and use the Google Home app to set the temp it should reach at a certain time of dayThe Nest Learning Thermostat (4th gen) can help save an average of 12% on heating bills and 15% on cooling billsWith natural heating and cooling, the Nest Learning Thermostat (4th gen) learns how the temperature outside affects the temperature inside, and pauses your system to help you saveAutomatically adjusts display brightness to deliver the best readability. You can also manually adjust brightnessThe thermostat is made with premium materials in elegant finishes; with a 60% larger borderless display and Dynamic Farsight, you can see info from across the room; choose the design, like a clock, the temp, weather, and moreSmart Schedule learns the temps you like, and when you like them; it suggests tweaks to help you save, and you can accept them in the app; and Adaptive Eco helps find an energy-saving temperature, based on the temperature outsideThe thermostat is easy to install yourself, usually in 40 min or less; you can control it and your other compatible smart home devices in the Google Home app; or change the temp just by using your voice with Alexa or a Nest smart speaker