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Thats basically how earthships are cooled. You can also run the pipe through an evaporative cooler to cool the air even more.
At some point there, you've just reinvented AC.
Only if you use a better working fluid and add compression and expansion steps, but a long pipe in a ditch filled with water isn't what I would call AC quite yet.
Aren't there AC systems that just evapourate water from municipal supplies to the atmosphere?
I mean, yes, I'd agree that blowing air over a standing water body isn't AC, but we're getting close.
You're thinking of a swamp cooler. In some places they work great, in other places they're next to useless.
Air conditioners are called that because they "condition" the air by not just cooling but also by reducing the humidity.
I think on a purely technical note, Air Conditioning goes beyond just cooling the air and involves reduction of humidity. Personally, I wouldn't consider it AC because you'd have to keep refilling the evaporator resivor, instead of just powering the device, but that is a nitpicky item that isn't technically a requirement.