You not only want your windows to add to your timber home’s curb appeal, you need them to create a weather tight, energy-efficient space. Look to these options for extra energy savings:
Triple/quad glazing. Three to four panes (layers) of glass provide added insulation from the weather outside. As a rule, the more layers you have, the better the protection (and the lower your energy bills will be).
Low-E coatings. Low-emissivity coatings employ a silver film, thinner than a human hair, that reflects heat. In the summer, it keeps the heat from penetrating your home, and in the winter, it bounces the generated heat inward, rather than letting it escape through the glass.
Gas fills. The cavities between panes of glass are filled with gas (often argon, but krypton and xenon gas also can be used), creating a dense but invisible layer of thermal resistance. Gas fills are often used in conjunction with low-E coatings.