A way to check is to measure from interior top jamb middle jamb and bottom jamb.
Top window slides down.
Heat and ac escapes and bugs can get in.
A dropped window is an indicator of a bad disconnected or misplaced balance shoe.
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.
Slide the balance friction spring between the window frame and window.
This can result in the window sash dropping or sliding down when you raise it.
Each double hung window in your home has four balance cartridges two per jamb liner.
When the top slash slides down the top of the window is left open.
Top window slides down when bottom window open is this norm.
Slide the window down so you can access the top of it.
The top tab of the spring should sit on the top of the window jamb.
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.
Is there something that can be adjusted.
One of the common problems associated with double hung windows is a dropped window or when one of the sashes becomes disconnected from a balance shoe.