I presume you fill the cooler with ice and then let the little fan blow across it. If so, I kinda doubt even block ice will last very long. For about twice that amount you can buy a cheap
5,000 btu window ac that will freeze you out of the boat on full power. That's what I had on my first 32 Morgan
. It sat in the companionway hatch
and was a pain to get around but oh my, the pleasant sleeping it provided. If you go that route
there are a number of articles on making hatch
adapters or even gutting the rascal for permanent installation
. The major downside is that you need ac power.
On the other hand, I really only used it at the dock
anyway. At anchor
a breeze booster or two was comfortable enough. Also, a quick way to lower your interior
temp by around 10 degrees is to simply rig an awning. The 5,000 btu worked great at night but during the day, in direct sunlight, it made the interior
bearable but not comfortable until I rigged an awning.
Anyway, good luck with your purchase