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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).
Do it like this! In short, if you have a heat pump with electric resistance heat as the supplemental heat source, keep the thermostat in the 'Heat' setting. Do NOT use the 'Emergency Heat' setting unless it's really an emergency; for example, when the heat pump doesn't work.