Common types of glazing that are used in architectural applications include clear and tinted float glass, tempered glass, and laminated glass as well as a variety of coated glasses, all of which can be glazed singly or as double, or even triple, glazing units. Ordinary clear glass has a slight green tinge but special clear glasses are offered by several manufacturers.
The advantages of double glazed windows are:
Adding a third or fourth layer of glass increases the insulation value of your window. Each layer of glass traps a significant amount of heat that passes through, increasing the windows protection against heat loss.