Home heating question: testing for common wire at thermostat

[arseNal]

@Hail_Ants

Yes, that’s exactly what I did and it worked perfectly. AC power is power, it makes absolutely no difference if it originates from the furnace, the WiFi thermostat simply needs a power source for its LCD display and WiFi functionality.

Here’s a video describing how to do it.

Thanks, I might try this if it proves too annoying to get the real thing from the furnace.