A way even the poorest can get minimal protection from excess heat

The visuals here tell the story of using large soda bottles and cardboard to make a structure for windows that actually cools the air a little. Certainly far better than nothing altho it won’t keep people alive as seasonal temperatures continue to increase.

https://inhabitat.com/this-amazing-bangladeshi-air-cooler-is-made-from-plastic-bottles-and-uses-no-electricity/