Amazon.com: C Wire Accessory Common Wire Kit for Most 24 VAC Thermostats (4 to 5 Wires), White (1 Pack) : Tools & Home Improvement
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Is the 'C' wire in my thermostat labeled as 'B'? : r/ecobee
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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How to install a Thermostat (C-wire adapter) - YouTube
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