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Also realize some places in the SW import their water from miles away through open sunshine culverts.
Some underground springs might originate from varying heights as well.
Many variables there.
My grandpa in early 1900s Indiana dug into a natural spring below his abode and created a house A/C swamp cooler loop when ice boxes were still around.
Berms or earth-sheltered houses go a long way in tapping into the constant 60deg below the surface.
Eskimos can heat an igloo with a candle.
A little engineering makes a lot of sense..
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Meanwhile other things are still happening.
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