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. And independent studies showed that it saved people an average of 10% to 12% on heating bills and 15% on cooling bills.
First it programs itself, then it pays for itself.
Before placing an order, make sure the Nest Learning Thermostat will work with your HVAC system