[snovv_crash]

Can't you use heat exchangers to stack the effect of swamp coolers, so each level gets another 30° colder until it's comfortable?

[pkulak]

Once you saturate the air, it’s all done.

[thelastparadise]

Is H2O bad to put in the air just like CO2?

[Filligree]

No, but if the air is saturated with H2O then sweating doesn't work. Swamp coolers are useful up to a point; ideally they bring down the temperature until you don't sweat. If they can't, and saturate the air instead, then they're worse than nothing.