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.
Attic fan thermostat override.
Just run one romex to the manual override switch that you want in the house.
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.
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In other words that switch will go straight to the fan motor.
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.
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You could wire the attic fan to be controlled that way but it would take a considerable amount of wiring.
Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
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I am hoping the extra airflow in my attic will help with ice dams.
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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.
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