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I want to replace my non-programmable RobertShaw 9500 thermostat with a programmable thermostat.

The current wiring uses these terminals: RH, W, Y, G.

With that set of wires, can I get a wire-powered thermostat with battery backup, or does it has to be battery only?

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You will not be able to get a "wire powered" thermostat, without at least one more wire. You'll need an additional wire, to connect to the C terminal of the new thermostat.

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