6 Best Attic Fans

Buying an Attic Fan

When your attic is an unconditioned space — i.e. not heated in the winter or cooled in the summer — its temperature and humidity can reach critical levels. That creates a breeding ground for mildew and shortens the life of your roof.

The solution is simple: Ensure proper attic ventilation. One of the best ways to do that is to install an attic fan. These circulate fresh air, slow mold growth and stabilize the temperature differential between the exterior and interior of the roof.

Not every attic needs a fan. If you have a finished attic or there’s sufficient passive ventilation, you may be fine. But if your attic is more than 20 degrees hotter or colder than the outside temperature, or if you see signs of mold growth, then it may be time to shop for a fan.

Here are a few things to keep in mind when buying an attic fan:

• Power source. Is the fan powered by electric lines, batteries or solar power?
• Location. Attic fans are installed through the roof or an exterior wall. These are called roof-mount and gable-mount, respectively. A “gable” is the flat triangular section of siding beneath a roof’s peak. All attic fans that penetrate an exterior wall are called “gable-mount” whether they’re installed on an actual gable or not. 
  
• Proper sizing. It may be tempting to buy the biggest, most powerful fan you can find. Don’t. A fan will draw air from anywhere it can, even gaps in your ceiling. If you install an oversized fan, you may find yourself accidentally heating or cooling your attic. Look for a fan with a cubic feet per minute (CFM) figure that’s roughly 70 percent to 80 percent of your attic’s square footage, and make sure you have adequate intake ventilation. (See IRC section R806 for more details.).
• Durability. An attic fan will be exposed to high heat in summer and frigid cold in winter. Look for a fan that can withstand those temperature swings, as well as any potential animal invasions.
• Ease of installation. Installing an attic fan is a good DIY project, especially if electrical lines are already in place.
• Convenience. Do you need to crawl up into the attic to flip a switch every time the fan should run? Or is it controlled by a thermostat?
• Cost. Most attic fans are relatively affordable, but a little comparison shopping will likely save you some cash.

Note: We’re talking about fans that circulate outside air in the attic only. Whole house fans are a different topic, outside the scope of this article.

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