Just turn it up and down. The Google Nest Learning Thermostat learns the temperatures you like and creates a custom schedule for your home. Nest automatically turns itself down after you leave, so you're not heating or cooling an empty home. You can control it from anywhere using your phone, tablet, or laptop. And Energy History lets you see how much energy you use and why. In independent studies, Nest thermostats saved an average of 10% to 12% on heating bills and 15% on cooling bills. That means it can pay for itself in under two years.