Now fill the cooler with cold water and Ice, and Chill! So far so good! Nice and cold, but it's only been mid 80's outside, so about 90 in the shed. I guess the real test will be when it's over 100! My only concern so far is that the 158GPH pump may not be enough. They make a 260ish one at Harbor freight, so I may have to upgrade to that in the future!