Kind of related but here’s a video from Technology Connections if you want to learn more about swamp coolers and why they only work in specific conditions
Seriously tho… swamp coolers in the desert?
They’re also called evaporator coolers. I am not sure if the word swamp refers to it performing a function that might be found around a swamp or how they operate.
Maybe the pool of water at the bottom is referred to as a swamp.
I linked the video but it’s been a while since I watched it. I am not sure if he explains the nomenclature.
A collection point for liquid drainage is called a “sump”.
Examples: A basement may have a low point in the foundation with a drainage pump installed to prevent flooding: a sump pump. Boats have a sump to collect onboarded water called a bilge. They’ve a bilge pump to remove the water.
Maybe “sump cooler” became “swamp cooler”?