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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
A thermostat can help keep your home comfortable and help you control energy usage. Your choice of a thermostat will depend on the type of heating and cooling system you have in your home, how you want to use your thermostat and the features you want to have available.