More in Windows Walls and Doors
Remove the stop. If the screws are stripped, just pull it off with a pry bar.
Remove the lower sash (Image 1), the middle piece called the parting stop (Image 2), and slide the upper sash down (Image 3). Cut the ropes, and pull the upper sash out. Remove old pulleys (Image 4).
Open up the weight pocket and remove the old weights (Image 1). Stuff the pocket with insulation (Image 2); this will improve energy efficiency.
Add a shim to the blind stop to create the correct spacing for the new window. Staple the access panel in place (Image 1), and attach the retainer clips (Image 2).
Snap in the jamb liners and sash stub (Image 1). Cut the old windows down to fit the new jamb liners (Image 2).