Window Factors to Consider
Double-pane windows are superior to, but more expensive than,
single-pane windows. Double-pane windows incorporate two parallel
sheets of glass with an insulating dead air space between them. Because
of the extra pane—and more importantly, the space between the
panes—double-pane windows greatly reduce the amount of heat transferred
through the window. Additionally, to make double-pane windows even more
efficient, the space between the panes is often sealed and filled with
an inert gas, such as argon.
Double-hung windows are designed to tilt in to allow easy cleaning from
inside the house. This feature is especially nice if a ladder is needed
to clean the windows from the outside.