Friday, October 26, 2012

Fans in the Attic: Do They Help or Do They Hurt?

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Homeowners in hot climates need to understand the difference between whole-house fans and powered attic ventilators

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[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Whole-house fan drawing.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Tamarack HV1600 opennewdoorsapril2010.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Whole-house fan cover detail from GBA library.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Whole-house fan table - PG and E.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Whole-house fan table 2 - P G and E.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

[![](http://www.greenbuildingadvisor.com/sites/default/files/imagecache/blog-river/Powered attic ventilator 3.jpg)](http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt)

There's a lot of confusion surrounding attic fans. Here at GBAGreenBuildingAdvisor.com, we regularly receive e-mails from homeowners with questions about attic fans: What's the purpose of the fan in my attic? How often should I run it? Do I need a bigger fan?

Before addressing these recurring questions, it's important to define our terms. First, we need to distinguish between three different types of ventilation fans.

URL: http://www.greenbuildingadvisor.com/blogs/dept/musings/fans-attic-do-they-help-or-do-they-hurt

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