Slide the window down so you can access the top of it.
Top window slides down.
Slide the balance friction spring between the window frame and window.
A lot of the times the coil springs balancing the window need adjustment to make it tighter but sometimes they have not been shimmed correctly at the middle of the windows.
About 10 years ago i had all the windows in my apartment replaced.
When the top slash slides down the top of the window is left open.
A dropped window is an indicator of a bad disconnected or misplaced balance shoe.
Top window slides down when bottom window open is this norm.
Four or five years later when i would open them to insert a fan or an air conditioner the top window would slide down 6 12 inches in a few of the windows.
A way to check is to measure from interior top jamb middle jamb and bottom jamb.
The top tab of the spring should sit on the top of the window jamb.
Each double hung window in your home has four balance cartridges two per jamb liner.
Heat and ac escapes and bugs can get in.
To adjust a disconnected balance shoe follow these steps.
If one of the balance shoes inside isn t working properly the sash will slide down when you attempt to raise it.
Is there something that can be adjusted.