Window lock?

Our new apartment has 2 windows in the bedroom: one opens onto the fire escape, and the other has the A/C unit installed in it. On cooler nights we prefer to sleep with the A/C off and the windows open, but I’m hesitant about leaving the window on the fire escape open while we sleep. Having it closed leaves the room pretty stuffy.

Does anyone know of a window lock that would (a) allow the window to remain open, but not too wide, and (b) be easily disengaged from the inside in case of fire? I definitely don’t want anything requiring a key – more of a physical barrier that’s easily removed from inside. Thanks!

By hangonsloopy |