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this post was submitted on 25 Jun 2024
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Condensation shouldn't be an issue as long as you're not cooling below the current dew point.
However, after experiencing one of these underfloor cooling systems once, I can say that the biggest issue is that cold air tends to be heavier and thus stay down. So in order to cool the entire room, not just the layer of air right above the floor, you need something to move the air, which is probably why they're providing fans. Either that or you can just lie on the floor all the time...
Floor heating works because warm air rises. I never understood why 'floor' cooling wasn't piped through the ceiling, instead. There are probably some engineering or heat transfer issues there, though.
I've seen a video where they did have cool pipes in the ceiling of a big building or skyscraper.
Heating/cooling works better with a heat sink, such as concrete. Water is also heavy, so laying it on top of the floor is far easier than suspending it from the ceiling. Also, in many places you will want to both heat and cool, and running heating and cooling in different locations costs up to twice as much. The easiest solution is to move the air, so fans do just fine.