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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).
Power consumption, measured in watts, as indicated on the appliance or its AC adapter unit. Appliances using more than 50 watts require high-power heating converters. Those using 50 watts or less require transformer converters. If you travel with both types of appliances, you can carry two converters -- or one converter with a toggle switch.