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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 problems in your Airstream are due to low 12 volt power most items need 12 volt power to operate even your AC system must have 12 volt power to activate the thermostat now that doesnât mean that the AC doesnât need 110 volts because it does. We will talk more on 110 volt system later in another article.