Yes, the Honeywell Home T9 smart thermostat requires a dedicated C-wire (common wire) to supply continuous 24V operating power to its internal color touchscreen and Wi-Fi radios. If your existing thermostat wiring bundle lacks an unused wire to serve as a C-wire, Honeywell 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.
1 votes
Marked as accepted