Do a Window Check
When you move into a new home, it is paramount to perform a window check. Make sure all of the windows in your home close and lock. If any of them do not lock or close properly, replace them immediately, as they are no good.
While it is often commonplace for someone to break your windows when they break in, easy penetration points (unlocked windows) are also possible. This is something you should also STRONGLY consider during the process of buying (or renting). There will undoubtedly be an inspector, so add this to the list of things you want to ensure are good with the house.