Double glazing is a useful technique of insulating your windows or doors to prevent any energy or heat transfer, thereby, maintaining an average temperature in your home or building. This technique includes two or more glass panes attached, containing space between them which is either filled with air or vacuum. https://jacoblewis906.wixsite.com/mysite/single-post/2019/09/19/An-Unconventional-Guide-On-Double-Glazing-Windows