One of the best insulators is air. To harness the excellent heat properties of air double pane windows were developed. Having two panes of glasses traps about 1/2" space of air that significantly reduces energy loss due to conduction.
Also important with windows is the shading coefficient. It is a value from zero to one where zero is the best score a window can receive. It is determined by how much solar resistance of window and is dependent mostly on the color and reflectivity of the glass.
One extra benefit of double pane windows is noise reduction. The additional insulation acts as an additional sound noise barrier.
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