Thank you for the good information! Do you happen to remember the
website you went to that mentioned the Adobe model could only run for
2 hours max?

It was www.promolife.com. Scan down and you will find the information. You can
use some of the guides at greenhouse suppliers sites to determine the size of
the cooler you need. Some of the ones listed on the Grainger site use a
synthetic pad that according to the information performs better than the paper
type.

If you go to the Grainger site click on the HVAC section and you will see
evaporative coolers. If you know someone who has a commercial business they
might be able to get you a discount. That's how I purchased the portable one
that I have.

When I build my next greenhouse I plan to have a permanent one installed.