Wait, that's a perfect use for SoF's should anyone be able to catch them... Radiators! Air conditioners! With a box around them with sufficient space to keep things from burning you could pour a steady stream of water onto them and with enough of these boxes placed strategically you could keep the entire fortress in a permanent mist thus producing happiness!
I'm gonna go try and harvest me some SoF.
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::shrug:: I guess I didn't need this space after all!