Nest Thermostat 3rd Generation with InstallYour thermostat controls half your energy bill more than appliances, more than electronics. So shouldnt it help you save energy? The 3rd gen Nest Learning Thermostat does. It learns what temperature you like and builds a schedule around yours. Since 2011, the Nest Thermostat has saved over 8 billion kWh of energy in millions of homes worldwide.*And independent studies showed that it saved people an average of 10 12% on heating bills and 15% on cooling