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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).
If you don't have thermostatic valves on your radiators, they should still have standard valves that regulate the flow of hot water, so keep them screwed further down than those elsewhere in the house-though not right down unless you want to turn them off altogether.he unheated rooms will take just some heat from the rest of the house, but this will always be less than the heat you would use by turning all your radiators on.