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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).
Many natural gas generators automatically start when the power goes out. They can power your furnace, refrigerator, some lights, and important appliances you rely on during emergencies, such as the television or radio.