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If there is not a 24VAC "C" wire coming from the heating/AC system , but there is already +24VAC (27VAC in my case) coming to the thermostat via the red Rc wire, why cant you jump the Rc over to the C terminal to power the thermostat? Or can you without any problems?

I have quite an old heating/AC system with two individual units/thermostats. The AC unit is all contained outside the home (blower within), with the large inlet/outlet ducts (~12" in diameter each). The Heating unit (electric) is a separate unit all contained inside the home (also with its...