Natural light, views, a visual connection with the outdoors: Glass makes possible many of the best features of houses. But as the amount of glass used in a house increases, energy efficiency usually decreases simply because glass windows and doors are not as effective as walls at insulating. For that reason, a great deal of research has taken place in recent years to improve the efficiency of glazings. Now, when you buy or replace a window or glazed door, you can choose from a variety of glazings. Generally speaking, the more energy efficient the glazing, the more expensive it is.

In this section of HomeTips, you will find information to help you make informed buying decisions about various types of glazing. In addition, you’ll find help for buying window film, understanding R-values, and even just replacing broken glass.