I live in an old house with only one remaining original window: a double-hung window in the attic. The other day a bird got into our attic. We went up to investigate - the bird had already flown back out, but we noticed that the top sash of this window had slid partially down. Looking closer, several of the panes within its colonial-style grid pattern looked like they were detaching from the grid. We were unable to move the sash up or down, and we were afraid a broken pane would come crashing out of the window if we pushed too hard.
We called around to get replacement windows, but heard the same answer from everyone we talked to: because of supply chain problems, expect the window to arrive in 10-12 weeks.
We went ahead and placed the order, but the next day we noticed that the top sash had slid completely down (didn't take a photo, but the entire top half of the window is now open!). There's no screen in this window, so the attic was just completely open to the elements. Since the window seems fragile and partially broken, we didn't want to try to force it back up. We hastily gorilla-taped plastic around the inside of the frame to keep out weather and animals.
I have no idea if this is the best way to do this, and 10-12 weeks seems like a long time. What's the best way to secure a stuck-open window until my replacement arrives?