The average cost to install an attic fan is about $450 (Installation of a gable-mounted electric vent with a thermostat). Find here detailed information about attic fan installation costs.
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The type of attic fan being installed. Existing wiring conditions. Access to the installation location. Factor in additional time for purchasing materials reading instructions and potential troubleshooting if you choose the DIY route. Preparing for the Installation Process.

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Insulation quality of your attic. If your attic is poorly insulated, more heat and humid air will leak into it. You usually have 2 options in this situation: pay the cost to properly insulate your attic or opt for a more stronger, more expensive attic fan to remove the excess heat.

For attic fan installation, its important to consider how well the attic is sealed off from the rest of the home. If an attic door or hatch is particularly drafty, turning the fan on will pull air-conditioned or heated air through the gaps, heating or cooling the neighborhood instead of the home.
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