What’s the purpose of my attic fan?
How often should I run it?
Do I need a bigger fan?
Can I install one myself?
These are all normal concerns homeowners may have, but to answer these questions, it’s important to first understand how a whole-house fan works. Metro Electric is here to help put your questioning mind at ease.
Whole-house fans are sometimes confused with ventilation fans that provide fresh air. Unlike a ventilation fan, a whole-house fan — an attic-mounted fan that exhausts air from a home at night — is designed to cool a house.
Once you’ve got your attic fan installed and ready to go, you might ask yourself when is the best time to turn on the whole-house fan — but the answer depends on your climate and your comfort range. The outdoor temperature should certainly be below 80°F — or, better yet, below 70°F. Turn on the whole-house fan when the air outdoors is cool and dry, particularly during the evening hours when temperatures have cooled.
The main advantage of using a whole-house fan instead of an air conditioner is to save energy. A whole-house fan usually draws between 200 and 700 watts — about 10-15 percent of the power drawn by a central air conditioner (2,000 to 5,000 watts). Talk about a money-saver!