Ac Thermostat Wiring Color Code

3rd gen nest thermostat. opened my sister and this yellow wire isn’t Thermostat wiring to a furnace and ac unit! color code, how it works Thermostat furnace decoded

3rd gen nest thermostat. Opened my sister and this yellow wire isn’t

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3rd gen nest thermostat. Opened my sister and this yellow wire isn’t

Furnace Wiring Code - Ac Thermostat Wiring Color Code Gfi Plug Wiring

Thermostat Wiring to a Furnace and AC Unit! Color Code, How it Works