Thanks for replies.

Alan, yes, and we wonder where the hive is.

Isaac, yes, a negative feedback self leveling condition, but way
hotter than habitable without pumping.

Gordon, thanks for the calculation, very useful.  Yes, in my childhood
my father piped town water at very low rate to the window mounted
air conditioners to increase their efficiency.  One of my jobs was to
maintain the piping system.

Danny, thanks for pointing out water quality.  The hindrance here is
quantity; we don't have enough plumbed rainfall collection area to do
it.  Plenty of unbuilt area to catch rain with, but nothing to keep it
from going straight into the ground or running off.  Rain is also
rare.  Atmospheric extraction is something I'd like to try.

Russell, thanks for the thermal energy storage in water.  Yes, power
is from solar photovoltaic array, a few months old.  In these
temperatures at full sun it is delivering about 80% of specified
power, instead of the usual 110%.  When a cloud covers us for a while,
and the sun shines, power is closer to 100% of specified until the
panels warm up again.

--=20
James Cameron
http://quozl.netrek.org/
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