So, yea most peeps here can buy those $100 window units, and cool at least 1 room in their house when the Great-Bake is upon us.
But what of the far larger population who subsist without electricity, active cooling.
Tp4 proposes these nations invest largely in pool treatment chemicals and filters. You dig deep enough, you can have an underground cooling pool/ cistern.
Either people take a dip in the pool themselves, or use minimal electricity to build a heat exchanger in that water.
Thoughts?