We are talking about a Honeywell smart thermostat, no?
Well, if you google: Do you need a C wire for a Honeywell smart thermostat, the answer is:
“The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. ... If your system doesn't have a C-wire, you'll need to run a new cable from your furnace to your thermostat to install most of the modern smart thermostat models. Thermostat wire is just a big spool of bundled, color-coded wires.”
And the above poster is correct, you can buy the adaptor instead.
Last edited by Velvet; 07-16-2019 at 05:18 PM.
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