Remove a Lower Window Sash from Modern Windows
Unlock the window. Push the sliders located on top of the lower sash towards each other.
Hold the left and right sliders in place while lifting up the lower sash; the bottom should be just above the frame.
Carefully pull the top of the sash towards you and out of the frame. Let go of the sliders and grasp the sash firmly while pulling it towards you and out of the frame.
Remove an Upper Window Sash from Modern Windows
Pull the upper sash of the double pane window down by the handles located on the top frame. The top of the sash must be below the frame.
Push the sliders on top of the upper sash towards each other. Hold the left and right sliders in place.
Pull the top of the sash towards you and out of the frame. Release the sliders and grasp the sash firmly while pulling it towards you and out of the frame.
Remove a Sash from Older Double Pane Windows
Wear safety goggles when removing the stops located on the sides of the sashes. Wood-framed sashes are held in place with two wooden stops (one on each side). Slide a wide metal putty knife into the crack between the stop and the window frame. Carefully tap the knife handle with a rubber mallet to loosen the stop. As one section becomes loose, slide the knife down and loosen another section until the entire piece is freed. Repeat this step with the other stops.
Grasp the top of the lower sash firmly and pull it out of the frame. If there are cords attached to the sash, hold them while you cut them with a pair of heavy-duty scissors.
Grasp the top sash of the double hung window, and carefully pull it down and out of the frame. Use the putty knife to open cracks between the upper sash and the frame if several coats of paint are restricting the sash. Cut any attached cords with heavy duty scissors.