Installation: What's that extra blue wire connected to my old thermostat? : r/Nest
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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
Where does the blue wire on a thermostat go? - Quora
Decoding Thermostat Wiring Colors: Essential Guide for DIY Installation
Where does the blue wire on a thermostat go? - Quora
Installing Smart Thermostat: Is this blue wire a control wire, and if it's connected here does that mean it's wired at the unit? : 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
