"DanG" wrote in message
...
An exhaust fan will require intake air. This can be as simple as opening
a window or using operable louvers opened when the fan unit comes on. The
exhaust fan can be mounted in a window, cut into a sidewall, punched
through a roof. A roof penetration requires the most to keep it rain
tight.

Knock your lights out he
http://www.grainger.com/Grainger/wwg/start.shtml

Roof mount:
http://www.grainger.com/Grainger/wwg/productIndex.shtml?from=Search&newSrch=yes&operato r=keywordSearch&search_type=keyword&action=Go%21&Q ueryString=roof+top+exhaust&submit.x=0&submit.y=0

Wall mount:
http://www.grainger.com/Grainger/wwg/productIndex.shtml?operator=prodIndexRefinementSea rch&originalValue=exhaust+fan&L1=Wall-Mount
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______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)


Good stuff! Variable speed too! Only negative I see off-hand is the price.
The roof top unit I'd need would run about $450 + shipping. I'd also need a
speed controller ($20?) -- they've discontinued offering them! And
shutters, ductwork and roof curb. But it's certainly doable.

Thanks




"DonC" wrote in message
...

"Reed" wrote in message
...
DonC wrote:
Hi all,

In every house I've owned, until now, I've installed a whole-house fan.
They significantly reduce AC costs and make for comfortable living.
Alas, that was while I lived in Michigan in houses that had attics. My
typical unit included a twist timer and variable speed motor.

Now we live in southeastern AZ in a condo with a flat built-up roof so
a typical attic unit won't work. But we still have frequent cool
nights that would we could benefit from.

Anybody here have any experience with WH fans in a similar setting? My
research so far has been disappointing -- no variable speed fans and
fewer available units : (

Thanks



Being in AZ I would consider a swamp (evaporative) cooler. A downdraft
model would easily install on a flat roof, and give you cooling when
needed, not just at night. I'll bet most of your neighbors have one, (or
A/C).

Yes we have AC. Some -- but closer to a "few" rather than most -- have
swamp coolers but they're simply a form of air cooling limited to about
20 degrees of cooling. When temperature get over 100, 20 degrees isn't
enough.

But we're talking about a different animal here. A WH fan "moves"
existing cool air supplementing AC at a much, much cheaper cost.