Is your thermostat running heat, air conditioning or both?
Would you take full advantage of features like the home/away setting?
How well insulated is your home?
Given these factors, will the Nest thermostat save you money? The answer is yes. The payback depends on your needs and preferences. Nest has done studies showing that, on average, a smart thermostat annually saves 10% to 12% on heating and 15% on cooling. I always tell my clients that if you regularly use the built in features, such as the ECO Mode and the Home/Away setting, you will beat those numbers easily.