Programs itself. 
Then pays for itself.
Meet the 3rd gen Nest Learning Thermostat. It has new rings and a big, sharp display. And it saves energy. That’s the most beautiful part.
 
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 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.