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Certain types of windows used in colder climates consist of two panes of glass separated by a gap of air. What is the advantage of this design?​

User Jefferey
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The air gap is filled with gas which increases the insulation between the glass pieces. Double glazed windows are highly efficient, reducing your heat loss or gain by up to 30% when compared to single-glazed windows.
User Mikael Lirbank
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