Free shipping. ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.Control the temperature with your voice using smart home devices that work with Google Assistant or Alexa Nest Renew makes it simple to support clean energy right from home; it works with your Nest Thermostat to help you automatically prioritize your usage to times when energy is cleaner or less expensive.Product note: You can also check your system’s compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page.