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The view out the window is as important as how much light and ventilation the window provides. Windows connect us to the outdoors and enhance the sense of interior space. For this reason, the placement and size of your windows -- and what you'll see from them -- is no small consideration.

http://www.youtube.com/watch?v=pSt3GXYLHvg

Insulating glazing typically has two, or sometimes three, panes of glass sealed together with either air or argon gas trapped between them to act as an insulator. Some units have a plastic film suspended between two glass panes. If the unit is properly sealed, condensation shouldn't occur between the panes; sometimes a drying agent (called a desiccant) is used in the spacer (the strip inside the panes, which helps keep them apart) as added insurance against condensation.