“Can the Honeywell Smart Thermostat Model RTH9585WF be used to control a high efficiency gas boiler?”
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Hi Aardvark! Thank you for reaching us. This thermostat its compatible with Gas Furnace/Oil Furnace/Electric Furnace with Air Conditioning (24-volt heating and conditioning systems). We suggest to label the wires on the old thermostat before disconnecting them as we don't follow color code. If you have any other doubt, feel free to call us at 1-855-733-5465, reference case #00836923. We will be happy to help! Thank you.
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