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4 months ago2 tips.
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Negative air pressure is your friend. If you open the windows upstairs and down and blow air out of the house it’ll suck air from the downstairs to the upstairs cooling the entire house.
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Bernoulli’s principle is your friend. Rather than having fans right next to the windows you’ll move more air if you back the fans a meter or so from the window. https://youtu.be/BhWhTbins_A?si=9LGd0_EmfPFBNnDJ
usr does mean user. It was the place for user managed stuff originally. The home directory used to be a sub directory of the usr directory.
The meaning and purpose of unix directories has very organically evolved. Heck, it’s still evolving. For example, the new .config directory in the home directory.