“Hi there ! our existing device is " Honeywell Home RTH2510B1019 7 Day Programmable Thermostat". We would like to upgrade to this model RTH6580WF. However, the new model requires the C-wire. Can you please let me know we currently have C-wire ?”
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C-wire may not be necessary. I didn't need to use it. Consult the instructions. It is well covered (note use of the clip in the instructions).
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