Meet the Nest Learning Thermostat, 2nd Generation. It learns from you and your home, programs itself automatically, and helps save energy when you??re away. And you can control it using your phone, tablet or laptop. In independent studies, the Nest Thermostat saved an average of 10-12 percent on heating bills and 15 percent on cooling bills. Based on typical energy costs, that means it paid for itself in under two years.