I am installing my thermostat but having wiring challenges.
For background, I replaced the furnace (and thermostat) last winter, ie, both are new. There is also an inline humidifier which turns on when the heater is running. It’s dry in Colorado so humidification is needed.
Wiring at the Thermostat: R (red), W (white), W2 (light blue), Y (yellow), G (green). There is no C.
Wiring at the furnace is difficult to see, but I believe the same wires are attached as they are on the thermostat end.
This is where it gets tricky. At the furnace end, there are two wires (both white) going into C connection/slot. I believe one of the C wires goes to the humidifier, not sure where the other white/C wire goes.
The big question: can I still install the C wire adapter as described in the instructions? I would be stuffing a third wire in the C slot.
Let me know what other relevant info I can provide.
Thanks in advance for any help.