New house, replacing old thermostat. No "C" wire. I went up the attic, and it's a bundle of wires on two different transformers. I haven't been able to spot the control board, but the thermostat wires lead back to this bundle, so I'd like to just try to figure it out from there. It's easy enough to trace back the typical four wires, but I have no idea where I would attempt to connect a C wire. Been googling/youtubing and nothings really giving me much to go on.
Any assistance would be great.
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