In single-hung windows, only the lower sash moves up and down. In double-hung windows, both sashes move, so you can open them from bottom or top.
Screens and storm windows are often installed on the outside of the window. In winter, storm windows stop drafts and insulate. Over time, the hardware that allows hung windows to open and close can wear out.
Lifespan: 15-20 years
Step 1: Inside your home, check the walls around your windows for dampness or staining. If you find any, it means water is getting in around the frames. Address the problem ASAP.
Step 2: Look at the frames and sills. You shouldn’t see any gaps between them and the walls. If you find gaps, seal them.
Step 3: Check for gaps where the glass meets the sash. Fix any cracked, loose, or missing sealant, glazing, or gaskets to keep drafts and water from creeping through.
Step 4: Cracked glass panes can be dangerous. Repair broken glass right away.
Step 5: Open the windows. They should slide smoothly and stay open or closed on their own. If they won’t stay open, repair them. While they’re open, check the seals where the sash fits into the frame. Replace any that are cracked, torn, or separated.
Step 6: Close the windows and lock them. The locks should move easily. While locked, windows should be tightly closed with no gaps around the sash.