I know that normally, swamp coolers take in external hot dry air, and put it out as cool wet air.
I live in the hot So. Cal. desert area. A small swamp cooler is cheap to buy, but won't do my whole house.
My thought: Can I take the hot, dry, internal air, get it moist/cool, send it through the central air ducts (to put some cool air into the rooms), and then just cycle that around again? The thinking is that it will eventually put enough water into the air that the humidity will persist long enough to actually be cool, without having to constantly re-cool fresh hot air.
But ... this seems too simple -- if it would work, wouldn't this have been done already?