To replace window panes in double-pane windows, first remove the window sash from the frame. Carefully take out the old pane, ensuring no damage to the frame. Clean the frame and install the new pane, ensuring proper sealing between the panes. Reinstall the sash and check for proper operation. Professional help may be required for precise installation.

Replacing window panes in double-pane windows involves removing the sash, taking out the old pane, cleaning the frame, installing the new pane, and reinstalling the sash. Proper sealing is crucial. Professional assistance may be needed for accuracy.