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Connecting Common Wire to HVAC with No Control Board : r/Nest

I found an unused wire behind my thermostat and at my control board. Is this an unused C wire that I can connect and use for my Nest? : r/Nest

Connecting Common Wire to HVAC with No Control Board : r/Nest

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How to install Nest Thermostat on an old furnace with no C wire? - The Nomad Studio