Yes, the Ecobee Smart Thermostat Premium requires a dedicated C-wire (common wire) to supply continuous 24V operating power to its internal processors, color touchscreen, and Wi-Fi radios. If your existing thermostat wiring bundle lacks an unused wire to serve as a C-wire, Ecobee includes a Power Extender Kit (PEK) in the box, which allows you to install a safe workaround at your furnace control board without needing to pull new cable through your walls. Verification: Check the voltage metrics in the Ecobee device settings menu to confirm that stable 24V power is flowing from the C-wire.
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