How does It Work? I mean how is this connected to the House AC?

Nest Learning Thermostat 2nd Generation

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  • Reading that again... The thermostat connects to your furnace (which provides 24 volts of power) and your furnace is connected to A/C. (As opposed to Air Conditioning... wow, too many terms with the same name)

    With the power from your furnace, Nest is able to charge a battery in the thermostat and use that to talk via Wi-Fi when needed. (and light up the gorgeous display when you approach)

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