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Often the easiest way to cool an attic is to install a fan at one or more gables. If your gable does not already have a louvered section, you will need to cut through the side of the house and install framing.
The manufacturer should provide a chart detailing how powerful a fan you need based on the size of your attic. Depending on the size of your house, you may require more than one fan. If you have no gable, install a roof fan.
Bring Power to the Attic
Before tapping into a receptacle or junction box for power, check the amperage on your attic fan, and make sure you will not overload the circuit. Shut off power to the circuit. Check with local codes to see whether you need to use armored cable instead of NM cable.
Mount the Fan
At a louvered opening in the attic, secure the fan by driving screws through its mounting brackets and into studs. If the studs do not allow you to center the fan in the opening, attach horizontal 2x4s that span between the studs. Attach the fan to the studs. You may choose to install louvers that close when the fan is not operating.
Make the Electrical Connections
The fan has its own thermostat switch. Mount the thermostat box to a framing member. Follow the manufacturer's instructions for connecting wires. Restore power and adjust the temperature control. Or you can control the fan with a pilot-light switch located in the hallway.
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