Step 1 secure the switch.
Install attic fan thermostat switch.
Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
Run a 12 3 w ground from switch box to fan thermostat box.
The fan s thermostat is already mounted in a box that s attached to the fan by a flexible conduit.
Place it so it s facing in the direction of the air that s being drawn out of the attic by the fan.
Screw this box to the plywood so it s in the direct path of the airflow step 11.
Run nm cable from the attic fan thermostat to the attic light.
Mount the thermostat in the attic.
Staple the cable within 8 inches of both the attic light box and the thermostat box.
Leave enough cable at each end to work with.
Use the hammer and staples to secure the cable to the joists at 12 inch intervals.