New answers tagged thermostat
1
You should be able to see onto the board where the rest of the wires connect and find the "C" terminal. It likely already has something connected going to one of the many wire nuts (and yeah, that is pretty sloppy).
You can test for sure using a multimeter. Set it to measure AC voltage, and then between the Rc (or Rh) and C wire you will see around 24VAC.
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