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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).
Most also include an electric heater that can be used when you're hooked up, which runs off 120-volt AC power. The power source is the important thing for drivers to consider when running their RV refrigerator. When the vehicle is in motion, you won't be able to have the fridge running off of electric power, unless you have a generator.