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Please try not using initialisms that a general audience won’t know. That’s why i had to look up the previous one and quoted the info so other people wouldn’t have to look it up also. USV doesn’t even show up in a googling
EDIT
I found it, USV means a drone boat
Is there a reason why you can’t get an air conditioner? There’s tons of valid reasons why it wouldn’t be an option, I’m just wondering what your situation is. Because nothing is ever gonna work anywhere close to as good as an air conditioner. If you can afford even the smallest air conditioner then it’ll beat every single diy method in most situations