Attic Fan Replacement

An unplugged fan against a white background.
  • 2-4 hours
  • Intermediate
  • 100-200
What You'll Need
Wiring instruction guide
Wire cutter
Electrical tape
Insulated gloves

An attic fan cools the attic by sucking out hot air through a gable or ridge vent and allowing cool air to come into the house through the soffit vents. This then contributes to a lower temperature inside your house. Given that an attic fan serves such an important purpose in your house, it is very helpful to know how to replace it if necessary. Here are the steps to take.

Turn Off the Main Power Supply

When working with anything that involves electricity, you should wear insulated gloves. To prevent your house members and friends from turning on the circuit breaker while you are replacing your attic fan, you can put a note on the relevant circuit breaker that says, ”Do not turn on—replacing the attic fan.”

Locate the main power switch of your house and turn off the circuit breaker that supplies electricity to your attic fan. Remove the electrical wires that are attached to the fan by loosening the clamp that connects them. Finally, using a screwdriver, remove the screws attaching the attic fan motor to the housing and pull out the attic fan.

Install Your New Attic Fan

Your attic fan replacement should be the same size as your old attic fan so you can insert it into the existing housing. After inserting your new attic fan into the fan housing, remove the cover of the regulator. Attach the regulator into a rafter. Attach a cable clamp and insert all the cables through the clamp. Tighten the clamp. Finally, with a wire cutter or pliers, remove the sheathing strip from the wires.

Attach the Wires

Attach the wires according to the wiring instructions that come with your new attic fan. Various types of attic fans are wired differently, so make sure to consult your wiring instructions guide.

Configure the Regulator

Insert the cover of the regulator after you connect all the electrical wires. By now, you will be able to configure your temperature controls. Attic fans have different ideal settings for a balanced cooling effect and energy efficiency, however, the ideal setting is usually around 95 degrees Fahrenheit.

Test Your Attic Fan

While still wearing your insulated gloves, turn on the circuit breaker that supplies electricity to your new attic fan. Test to see if your attic fan is working. If your attic fan is not working, most likely it is due to incorrect wiring. Check your wiring instructions guide again and do the necessary wiring changes.