Double Hung Windows
The Primary feature in Double
Hung Windows is that both window sashes operate
vertically, as compared to Single Hung Windows,
where the bottom sash is the only operational section.
The appearance of the Double Hung Window is stacked,
so that both sashes can slide past each other. The
name "Double Hung" comes from the design
of both sashes being hung from ropes that are counter-balanced
with weights. The glass openings in the upper and
lower sash are typically of equal size. The ability
to open both sashes creates cross ventilation, where
the warm air exits through the top opening and the
cooler air enters through the bottom opening.
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