Quite possibly, yes. Especially if there's a house on the same street with
unlocked) windows or doors.
As was pointed out by someone else, you can put screws in the upper track to
while the window is closed.
It's never possible to have a completely secure home. The more secure your home
though, the less likely it is to be targeted by a burglar. Burglars like homes
easy to get into, have some valuables, and can be accessed undetected.
I have two styles of aluminum windows/sliding doors in my house. Vertical
and horizontal. On the horizontal ones,
I cut a piece of rebar long enough to allow me to keep the windows open yet
prevent anyone from crawling through. I lay this down
in the lower track of the window unit. When I want to open the window
more, I have a magnet on one of the mounting screws and the rebar just
attaches to that, vertically. The rebar is small enough and blends in with
the color of the window so it works for me. The same could be done
for vertical openings I suppose but I haven't done them yet.
I did like the idea of putting screws above the sliding door to prevent the
door from being lifted out. I'm hoping to trash the damn thing anyway and
put in patio doors but I'll have to remember that one.
One advice that hasn't been mentioned is similar to putting a couple
of screws in the top track. Just slide a good fit piece of wood on the
top track that'll cover the whole sliding window. The hard part is finding
the perfect size wood. A renter lady on the bad part of town told me this.
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