I installed my new Nest thermostat into the wall(looks really sharp) but when setting it up it said I need a c wire. I received the google adapter to plug into the furnace, and believe I have found the 2 wires that go to my thermostat (R & W) but I don’t know where to put the c wire. I have an old Lennox furnace that doesn’t have a circuit board which is making it difficult for me know what to do. Can anyone with experience with this help please?
