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New Thermostat Wires Help
Hello, I am going to remove very old three wire thread woven thermostat wire and replace with modern three wire (heat only). Currently, furnace has newer two wire and they meet in the junction pictured (I assume this is not to code). The second picture is where the two wire connects to furnace. Question 1 Where will this third wire be connected here? Question 2 I would run a two wire but smart thermostats will need the third wire, correct? TIA