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That's a dew point of 91 degrees, in the "severely high" and even dangerous range. I remember seeing conditions like that on the Gulf Coast, and it's oppressive indeed.

But the cooler will only run for an hour and a half on "high cool", so on a long trip you'd have to find more ice at every stop. And those really hot days are the ones where density altitude is high and weight becomes even more important, so the extra 35 pounds can be a problem, too. I'm sure it would be nice for people in hot climates on short trips, but unfortunately it wouldn't be a good choice for those of us likely to encounter really hot weather only on long trips.

25 pounds of solid ice has a volume of less than 12 quarts, so I assume that the "30 quart" cooler is less than half full when loaded to capacity?

Roy