The Nest Thermostat helps save energy. As of 2011, it’s saved over 4 billion kWh of energy in millions of homes worldwide. Independent studies showed that it saved people an average of 10-12% on heating bills and 15% on cooling bills. That means in two years or less, it can pay for itself. Photo 3 of 6 in 5 Key Elements of Smart Home Functionality

5 Key Elements of Smart Home Functionality

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With a programmable thermostat, you can set the temperature to different levels at predetermined times throughout the week. For example, during the winter, you can set the inside temperature to a lower level when you are at work and the house is unoccupied. This can save you nearly $150 on your yearly utility bills—depending on climate, home insulation, and other factors.