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National Geographic : 1979 Nov
Contents
This view made practical with energy efficient PPG glass. What could be more pleasant than a room like this? Open to the beauty of an inviting outdoor setting. Comfortably lighted by the daytime sun. Bright. Cheerful. Most of all, it's practical. It helps this home conserve energy. This glass wall exemplifies the success of a new concept in energy conservation called window management. It means that windows and glass, properly placed and designed, can use the sun's heat and light to improve the V energy efficiency of your home. PPG makes glass that can take full advantage of this idea in any climate. In cold northern climates, for instance, PPG Twindow® Xi® welded-edge glass uses dry insula ting gas between two sealed panes to reduce heat loss through a win dow by more than 40 percent, compared to single-pane clear glass. And in the south, PPG Solarcool® Bronze glass reflects almost 50 percent more heat than clear glass. And that may help to reduce air conditioning needs. Both kinds of performance may add up to significant fuel savings. PPG also makes tinted glasses which control the brightness and heat gain of a strong sun. They can be used in single, double or triple glazed construction designed to suit the needs of any home, north or south. Work with your architect or contractor in making quality glass and the sun work together. For you. There's much more to learn about window management. Find out how you can save energy with glass. Send for the free book, "Home Styles for the Eighties' PPG Industries, Inc., Dept.NGN-4119 John D Bloodood, architect One Gateway Center, Pittsburgh, Pa. 15222. PPG: a Concern for the Future INDUSTRIES
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