comments:
I bought $20 adjustable screens for an apartment that had no screens on my windows. They were not secured by anything other than the window holding it in place (sim to windows you described I believe) Given they weren’t stable, I only did that when I was in the room etc. it was in the main room so I was always there. If I went to bed or left the house, I’d remove the screen and close window. Highly recommend this. Another option is installing a window fan, which would be more secure and therefore not a concern for the cat. I say this as I think AC units are an American thing so not saying that? However I also grew up where we didn’t have a lot of money so we didn’t have ac units in our bedroom, but we had window fans. I would definitely try some other options before putting my cat in a cage, not sure that would ever be my solution personally. Edit to add link: https://a.co/d/05f1Ixbq