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I think that the evaporation in theory is able to cool the room, the heat energy is transferred into launching a bunch of water molecules airborne so to speak. Hanging some wet towels around would also do that.
However, the performance of such small devices is probably not sufficient to significantly cool a room, and it has a lot of drawbacks (filter gets mouldy easily, ...)
Here's an excellent video about these swamp coolers: https://youtu.be/2horH-IeurA (he has many videos on heat pumps and stuff)
The more immediate drawback is after running it for a little bit, you'll lose the ability to sweat.
Well, you'll still sweat, it just won't evaporate due to high humidity.
It's at best a very short term solution before it starts making it worse
Unless you are in a dry climate. Our house is cooled almost entirely off of a swamp cooler (small window unit for the bedroom) and the humidity is never noticeably high.
Gotta live in a desert for that. If not yeah swamp coolers are very limited.