The Nest Learning Thermostat is the first thermostat to get ENERGY STAR certified. It learns what temperature you like and builds a schedule around yours. Since 2011, the Nest Thermostat has saved billions of kWh of energy in millions of homes worldwide. * And independent studies showed that it was saved people an average of 10% to 12% on heating bills and 15% on cooling bills. So in under two years, it can pay for itself.