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Do I need a C wire? Yes! You should ensure you install a C wire if you are upgrading your thermostat. Almost all modern thermostats, whether smart or not require a power source. This doesn’t seem likely to change anytime soon.
If you have Ecobee thermostat and only have two wires, a red and white one, with no C wire, then this is the article you have been waiting for.
The C wire, or the common wire, then enables the continuous flow of volt power to the thermostat, usually 24 volts.
