There is a retirement community nearby that used water cooled (!) air conditioners. These date from the 1960s and, to the best of my knowledge, have all been replaced by now. No, not evaporative/swamp coolers. These were air conditioners that used a controlled stream of water flow to cool the condenser coils. As you can imagine, they used a lot of water. A solenoid valve would allow a steady stream of water as long as the condenser was running. The condensers were fairly small and generally installed in the garage attic.

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The apostrophe troll.