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Thermostat Wire Color Code: Complete Detailed Guide
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Installed Nest Thermostat. Have a blue wire I did not connect to anything but the system works. What's the risk? : r/hvacadvice
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hvac - Can I use this unused blue wire as my C wire for my new Nest thermostat? - Home Improvement Stack Exchange
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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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