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My current thermostat does not a C wire connected to it but the incoming bunch has an extra blue wire that is not connected in both ends. Is it ok if I
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![Thermostat Wiring Color Code [Decoded and Explained] - YouTube](https://i.ytimg.com/vi/xQd6GERVzVM/maxresdefault.jpg "Thermostat Wiring Color Code [Decoded and Explained] - YouTube")