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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
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