Staple the cable within 8 inches of both the attic light box and the thermostat box.
Install attic fan thermostat switch.
Remove the cover of the thermostat to expose the black and white wires as well as the green ground screw.
Start by screwing the thermostat switch to the plywood frame that houses the fan.
Mount the thermostat in the attic.
Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
The fan s thermostat is already mounted in a box that s attached to the fan by a flexible conduit.
Run nm cable from the attic fan thermostat to the attic light.
Screw this box to the plywood so it s in the direct path of the airflow step 11.
Leave enough cable at each end to work with.
Ideally the thermostat should be mounted to a rafter along the wiring path and away from the draft of the fan.
Run a 12 3 w ground from switch box to fan thermostat box.