[RE-wrenches] Solar Attic Fans

[Jason Szumlanski]

The problem I see is that most brands have a motor rated for much higher
power than the paired solar module. Most manufacturers use the same motor
on, for example, their 10, 15, and 20W fans. Nonetheless, if you size and
locate the fans properly for the attic, you will see a dramatic reduction
in temperature. They may not *seem* to move much air, but the temperature
reduction is all that really matters... They work in that sense, at least
in SW Florida where attics get blazing hot and solar resources are
excellent.

That being said, there are lots of valid arguments against them. I don't
have one at my home (I'm saving up for foam insulation).

Jason Szumlanski
Fafco Solar




On Fri, Jun 8, 2012 at 12:19 PM, Mark Byington <markb at cobaltpower.com>wrote:

> Carl,****
>
> ** **
>
> Although of course I love all things solar, we actually don’t recommend
> solar attic fans, for the simple reason that the ones I have seen don’t
> seem to move much air.****
>
> ** **
>
> We generally install the round 24” dia mushroom-shaped fans which move
> lots of air, and have a thermostat so they only run when necessary.  Sorry
> I don’t know the brand name, but we buy them at Home Depot, and they seem
> to be well built, fairly quiet, and reliable.****
>
> ** **
>
> -------------****
>
> Mark Byington****
>
> Cobalt Power Systems, Inc.****
>
> (C) 650-714-8150****
>
> markb at cobaltpower.com****
>
> www.cobaltpower.com****
>
>  ****
>
>  ****
>
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