I want to install a new Nest Thermostat (07/2021 manufactured) and my
system has W, Y, G, Rh & Rc wires (Rh-Rc have a jumper and one red wire
connected). How do I know if I need a 'C' wire? When I did the
compatibility check, I read that my 4-wire sy...
Thank you for your reply, Jake. You may proceed with locking this
thread. Since I am still not sure if I need the 'C' wire for a proper
Nest install, I am currently not interested in installing the Nest
thermostat. Sincerely,Alan Farmer