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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).
Make sure you buy a high-voltage thermostat designed for electric baseboard heat. Thermostats for electric-baseboard heaters operate at the same voltage as the heater -- usually 240 volts.Low-voltage thermostats designed for gas, oil, or heat pumps won't work and are extremely dangerous on a high-voltage system.ake sure you buy a high-voltage thermostat designed for electric baseboard heat. Thermostats for electric-baseboard heaters operate at the same voltage as the heater -- usually 240 volts.