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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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wiring - Can a thermostats C-wire be connected to the furnaces R-terminal without issues? - Home Improvement Stack Exchange
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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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