Robert Parks via pbs
Sun, 10 Jan 2021 07:31:18 PST
When I was growing orchids (mostly high elevation tropicals), I had a two
stage about 70F/20C the misters would go off every hour or so,
above 85F/30C they went off much more frequently. No bad results from the
rare blazing sunny days above 100F/38C. However, lovely soft water with
very little dissolved minerals, and plants happy to have moisture on their
roots (almost all mounted rather than potted). In my new greenhouse, and
certain outdoor areas, I'm probably going to install a mist system for
extreme heat days (<5/year).

Chad, yes, some kind of swamp cooler is probably more appropriate for you.
I remember a bank of swamp coolers at a nursery back in North Carolina that
kept a massive greenhouse nearly pleasant even in the oppressive heat and
humidity. I think highly mineralized water can be a problem for swamp

Air conditioning uses significantly more electricity than an evaporative
setup. If water is cheaper/more available, you would only be paying for the
fans. AC also tends to reduce the humidity in the cooled air.

in cool humid San Francisco, except when it isn't (2 days over 100F, 5 days
over 90F last year)

On Sun, Jan 10, 2021 at 6:54 AM Chad Cox via pbs <> wrote:

> Bob,
> I do currently have misters set up, and they work all right keeping the
> temperature down. But I mostly collect Hippeastrum species and other bulbs
> that like to be mostly dry, and I have found that the extra water on them
> is not appreciated. Also I have hard water and so when the misters are on
> it leaves a white calcium residue on the leaves of the plants below the
> misters. Also undesirable. I am considering a “cooling wall” in my new
> greenhouse instead of misters.
> Chad in Elverta CA
> Sent from my iPhone
> Chad L. Cox, Ph.D.
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