What if I don't have a C-Wire? – Smart Thermostat Guide
Old thermostat has an unused blue wire, should I use it for Nest 3rd gen? : r/Nest
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Need assistance with old wiring for Nest thermosta... - Google Nest Community
Blue "C" wire is connected to "Y" on old thermostat. New thermostat has separate "C" hookup. Where does the blue wire go - "Y" or "C"? : r/Nest
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How to Install ANY Smart Thermostat | No "C" Wire | Detailed Version - YouTube
hvac - Can I use this unused blue wire as my C wire for my new Nest thermostat? - Home Improvement Stack Exchange
Where does the blue wire on a thermostat go? - Quora
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thermostat - Where can I connect the C wire on the A/C side? - Home Improvement Stack Exchange
wiring - Can I just extend this blue wire in furnace for Nest thermostat? - Home Improvement Stack Exchange
Installation: What's that extra blue wire connected to my old thermostat? : r/Nest
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What to Know About Thermostat Wire Color Codes - World Leader in Low Voltage Cables
