Air Conditioning?

[Dave R]

Swamp coolers don't work when it's humid. They are made for hot and dry environments. The ice cooler would work around here, but that seems kind of inconvenient.

A used hatch-style air conditioner like a "Cruise Air" would probably be your best bet. They can be had for $250 to $400. You'd need to rig shore power, but it does not have to be a permanent system.