Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
Attic fan thermostat override.
I would like to install an override switch in order to manually turn it on during the winter.
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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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You could wire the attic fan to be controlled that way but it would take a considerable amount of wiring.
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Just run one romex to the manual override switch that you want in the house.
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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.
I am hoping the extra airflow in my attic will help with ice dams.
In other words that switch will go straight to the fan motor.
Sure that should be fairly simple for you to do.
You just need to parallel the thermostat with a standard wall switch.
At the switch the romex s white and black will go on the two screws of the switch.