What Causes Foggy Windows?

Foggy windows are a frequent concern for homeowners. A practical solution is to replace the glass with a new insulating glass unit. Insulating glass, commonly referred to as “double-pane” or “Thermopane” glass, consists of two (or sometimes three) panes of glass separated by a spacer bar. This spacer is sealed with a double layer of sealant around the edges. Inside the spacer bar, desiccants are included to absorb any moisture that may form between the glass layers.