Kirsten, I have all my windows protected and would never let a cat sit in an open window. I have screens against the flies but as they are not very stable I allow them only there when I'm in the room. I have a net around my balcony (there is a cat shop here, they sell and put in these nets -very professionally and it works well even after 7 years now). Our windows can be tipped (so that they just hang on the bottom) and then I have these metal "Kippschutz" so that no cat can fall in the gap. (Sorry technical terms in English are above my level).

I agree that here are many people who think cats can always fall safe -which is not true for any height and a cat falling from the first floor can have more injuries than one that falls 15 meters. Tigris human parents lost a cat that fell from the roof garden among 10 m deep -since then there roof garden has a fence.