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Btw, the slant window isn't that convenient; air barely replaces this way.
It takes longer but it works perfectly fine for having fresh air constantly without having the window completely open. Mine is currently opened like that and I can feel the fresh winter air 🥰
Where did i read this... i think it is about impact ventilation vs. always a bit open, the later wasting way more heating energy. At least, downward or sideways slant would be more effective (cold air is heavier).
Downwards it has 2 big flaws. More complex because gravity and you would knock stuff of your window sill.
Oh yeah, I really didn't think about it from an energy perspective, but I also never slant it when I heat. Only when it's a little warmer, in winter I do "impact ventilate". (What an interesting word, in German it's "Stoßlüften", so a very similar literal translation :D)
Really interesting point with the mass though! I do notice active air exchange when it's colder, however, so not sure if it would make such a difference?