I am hoping the extra airflow in my attic will help with ice dams.
Attic fan thermostat override.
Sure that should be fairly simple for you to do.
Make the other wire from your 12 2 run off your switch to your fan and splice it in with the wire going from the thermostat to the fan motor.
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I would like to install an override switch in order to manually turn it on during the winter.
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I have an attic fan that runs off a thermostat the gable fan type.
In other words that switch will go straight to the fan motor.
Just run one romex to the manual override switch that you want in the house.
Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
You did note that the neutral proceeds straight to the motor of the exhaust fan and the thermostat just makes and breakes the hot wire.
If you want to just be able to override the thermostat to turn the attic fan on at night there is a very simple solution.
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You could wire the attic fan to be controlled that way but it would take a considerable amount of wiring.