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Many people don't understand how effective Qanats are, but they were/are used to store freakin' ice in the middle of freakin' Iranian scorching desert - seen one near Yazd.

Big respect to the builders/engineers. It's 2400 years old

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Yes, impressive but the scale had to be sufficient - it wouldn't work well for a smaller residence. That said, a large enough modernized variant may work well for neighborhoods.

Just FYI: You seem to have been shadowbanned for quite a while. I vouched for this comment to let you know, because I didn't see anything obviously deserving such treatment.

He was banned and notified of it: https://news.ycombinator.com/item?id=13606809

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