"Owen Reese" wrote...

Living in northern Colorado area.

Re mold - yes, that's one consideration I have in mind. However I'm looking
for
a portable, so "installation" per se does not entirely apply. I see it's an
issue
for the water tank part, tho.

What is the normal relative humidity in the summer where you live? If it's
over 30%, a swamp cooler may not work very well.