Window Factors to Consider | Best Pick Reports
Multi-pane glass. Double-pane windows incorporate two parallel
sheets of glass with an insulating dead air space or gas 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.
Special coatings. A variety of special coatings can be applied
to the glass pane to further reduce the amount of
heat transferred through the glass. Low-emissivity glass (or Low-E
glass, in industry jargon) is designed to reflect infrared heat back in
the direction it came from. In the summer, it keeps the infrared heat
out. In the winter, it keeps the infrared heat in.