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this post was submitted on 03 Jul 2023
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This is probably not exactly what you're looking for, but I saw a video once of a simple geothermal "ac" system, where you basically bury a large vessel of water in the ground, and then use a system not dissimilar to a water bong to cool pumped air down and then pump the cooled air into your living area. The ground at around 6 feet into the ground is around 20 degrees cooler than the ambient air temperature on the surface. It's my understanding that this type of simple diy system would be most useful in third world countries, but it could be useful in case of grid failures too. I'll see if I can find the video
https://youtu.be/zb5aHQO47kM
Here it is, like I said, I don't know how useful this would be in a survival situation, but probably better than nothing? Seems like this was meant to be built with materials that are easily found and available... This guy's channel also has a lot of helpful things for living off grid as far as power and stuff