House Thermostat Wiring White Wire Ob Or W

Very confused by my home's thermostat wiring. y/o? w/b? : r/nest Thermostat confused

Very Confused By My Home's Thermostat Wiring. Y/O? W/B? : r/Nest

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Very Confused By My Home's Thermostat Wiring. Y/O? W/B? : r/Nest