The new Nest Learning Thermostat has a thinner, sleeker design. A bigger, sharper display. The 3rd generation Nest Learning Thermostats is more beautiful than ever. And independent studies have proven that the Nest Thermostat saved an average of 10% to 12% on heating bills and 15% on cooling bills. That means that in 2 years, the Nest Learning Thermostat can pay for itself.