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First get four guys (pablo, felix, mario?, manuel? hard to read the t-shirts) to dig a village well as shown in the video. A several weeks work it looks like, if not more.
Notice how once they get down to the water table they build A cylinder of masonry to keep the rain and mud out of the water supply.
So the idea is:
Build a building around this cylinder and dig the floor down from street level. This dug out area can be cooled using some water from the well similar to a swamp cooler. A fan might be required, but with careful design the fan might not be needed. This would even work if the well water was salty and not potable. A knee high wall to keep very hot air next to sand/dirt out of the building and maybe a walled in courtyard would be advisable.
Public or private; A central building in a village that stays cool in the desert environs would have value.
dig dig dig
HAND DIGGING A WELL IN MEXICO [popbottle, Nov 30 2014]
Here's how you get it done...
[normzone, Nov 30 2014]
||Swamp coolers are most effective in low-humidity
environments. You don't want to do this if the village is
located in a jungle.
||Another gotcha is the sewers. Both for rain water and sewage. All flow has to be far away from the well and nothing that will leak.
||The building I now have in mind is a sort of half buried doughnut with a thatch roof. And large beer signs.