I'm in inland, northern California, and have the same high temperatures,
late Spring through early Fall. I grow in an 8 x 10 polycarbonate glazed GH,
and have had pretty good cooling with a fan installed high under the eaves
on one end, coordinated with a floor vent on the other end. I also use an
automatic floor misting system. Don't know what part of this would work in a
screen house. Bought the components from Charley's Greenhouse, which is on
the web.
Tom

From: bb
Newsgroups: rec.gardens.orchids
Date: Thu, 29 May 2003 19:38:58 GMT
Subject: orchid house fans

Ok, the orchid house is just about done. Last roof panel finally went
up yesterday after being on back order for two weeks. Floors were
sealed and stained semi-transparent white. I had figured to get the
floors done in two to three hours last Sunday and ended up spending a
full ten hours on it. The thermometer on the wall was reading 98 most
of the day.

Anyway, I'm down to installing the screen on three walls. Today when
I stopped home for lunch the old wall thermom was reading 94. I think
my next priority is going to be installing fans for ventilation.
Anyone have suggestions?

I figured on going with a couple of outdoor ceiling fans, but another
orchid house owner said he gets much better results with floor fans.
What does everyone use, and what are the results?

Thanks for any help.

bb