Windows provide natural light and ventilation, add to the character of a home, create pleasant interior spaces and offer outdoor views. The development of energy efficient windows means that windows can provide all these benefits as well as significant reductions in wintertime heat loss.
This article is a great backgrounder on everything about windows. It describes the parts of windows and the various kinds of windows (fixed, sliding, casement, awning), discusses various window materials, and explains the developments that have created energy efficient windows, like Low E windows, gas-filled windows, and triple glazing. There is also a section on understanding energy efficiency ratings on windows.
If you’re interested in energy saving windows, read on.