On Fri, 21 Apr 2006 20:38:37 GMT, "Dave Lyon"
wrote:


"Larry Jaques" wrote in message
.. .
On Fri, 21 Apr 2006 16:22:40 GMT, with neither quill nor qualm, "Dave
Lyon" quickly quoth:

That would be self-defeating. You'd be introducing hot air and
moisture into the air which would then have to be removed by the A/C

Hot air? How does an evaporative unit add hot air to a room?

By sucking it in from outside. A/C units recycle interior air while
dehumidifying and cooling it. Swamp coolers suck in outside air and
pass it over water (humidifying it) in an attempt to cool it.

Oh, I see. All of the evaporative units that I've seen use the air from
inside the building just like a normal AC does.

The little portable coolers do use room air, but they're meant more
for spot cooling rather than room cooling. The built-in or window-
mount evaporative cooler units bring in outside air, dump a lot of
moisture into it, and will help some in a dry climate. And you need a
few windows or a door open, so that airflow has a way out, too.

I'll go with the rest - insulate and weather strip that shop,
pronto. Put at least R-13 Fiberglass batts in the walls, and someone
mentioned OSB instead of drywall, which will work fine if finished in
an enamel paint - do NOT leave raw wall surface exposed. You want to
make sure splashes of oil and muck don't soak in.

If you can find it cheap (good luck...) the fiberglass reinforced
plastic pebble-finish panels from commercial kitchens would be the hot
ticket over a layer of 1/2" drywall for fireproofing, it's impervious
to almost everything - hot wrench excluded. And you can caulk around
the plastic extrusion T-joiner strips to make it watertight.

Put as much insulation in the ceiling as you can - R-22 or better,
and then make sure you ventilate the attic above the shop with
turbines and eave venting for intake. Same as a house, if the attic
is 160F Plus, the heat will radiate down into the shop. If it's a
cathedral exposed ceiling, you need to space the insulation away from
the sheathing - leave an air gap above the insulation, and have eave
and ridge ventilation to keep the roof from melting.

-- Bruce --

--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
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