Nest Pro Learning Thermostat, 3rd GenNest Pro Learning Thermostat (3rd Generation) Meet the new third generation Nest Learning Thermostat. It's more beautiful than ever, with a thinner, sleeker design and bigger, crisper display. And it's proven to help save energy. In independent studies, the Nest Thermostat saved an average of 10 12% on heating bills and 15% on cooling bills. Based on typical energy cost, that means it paid for itself in under two years. Proven energy savings. The Nest