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The brutal heat broke around the 12th of May. The weather actually improved. The daytime peaks dropped down to a much more manageable 33 degrees Celsius. The sun stopped trying to actively murder us.
Because it wasn't a furnace anymore, I stopped using the roof misting setup much.
Which is fine, because the system was already dying. The nozzle clogged up. The water out here is incredibly hard, full of minerals that just love to choke up tiny orifices. We had a basic filter hooked up to the line, but it was nowhere near enough to stop the inevitable calcium buildup.
It was a prototype, a temporary fix for a desperate situation. And it proved the concept: evaporative cooling on porous tiles definitely beats back the heat. But without a much heavier, more robust filtration system, you're going to be constantly unclogging nozzles.
By June, I just dismantled the whole thing. The heatwave was over. The experiment was over. Now it's just a pile of plastic tubing and calcified brass, waiting for the next time the sun decides to boil the sky.