Strictly speaking, the Nest Thermostat E does not mandate a dedicated C-wire during installation, as it can attempt to trickle-charge its internal battery using power-stealing pulses drawn through standard HVAC heating and cooling wires. However, installing a dedicated C-wire is highly recommended to ensure stable, continuous power delivery. Without a C-wire, homes with certain high-efficiency or heat pump systems frequently suffer from sudden battery drainage, Wi-Fi drops, and unexpected HVAC cycling errors. Verification: Check your HVAC control board and thermostat subbase to confirm whether an active blue C-wire is connected to the 'C' terminal.
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