this post was submitted on 25 Jan 2024
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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?