Crystal.L
Junior Guinea Pig
I don't know anything about the air conditioning and stuff but I do know that in my house, we have like a screen "door" for every window. They are there to keep animals and bugs from flying in when the window is left open but they are not there to prevent people from falling out of the window. A window screen "door" might help with your worries of a predator coming through the window. They look like screen doors but your can't open them.