Only an RC wire

[FLAAC]

My system as a red wire that is connect to RC on my old Thermostat, do I just plug that RC wire into the R on the NEST ?

[SoriaD_]

Hello FLAAC,
Thanks for reaching out to the community about your Nest thermostat wiring! Help is here.

You're absolutely right! The wire you're referring to should be connected to the "R" terminal on your Nest thermostat. This ensures your device receives power and functions properly.

If you need further assistance with your thermostat, feel free to create a new post. We're happy to help!

Best regards,
Douglas