For me, it made a larger difference in my awareness of how much energy I actually use. Before nest I simply programmed my thermostat once and never touched it a

For me, it made a larger difference in my awareness of how much energy I actually use. Before nest I simply programmed my thermostat once and never touched it again because of the pain. Now I consciously adjust the temperature throughout the day from my desktop or phone. Just being able to walk out the door and turn the temp down from my phone if I'm suddenly not going to be home for a while is savings enough for me. I'm sure there are other thermostats that do the same thing but nest has done their advertising right and their interface/product design is top notch.