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Show Double-Glazed Glass Reduces Heating Cost Double-glazed glass makes possible pos-sible the use of large windows in homes, reduces heating costs, and minimizes cold drafts of air, says American Builder, magazine of the building industry. The magazine explains that a double-glazed window consists of two panes of glass separated by a hermetically sealed space. Installations Instal-lations of this kind are used for most picture windows. "Originally available on a custom-made basis only, these windows win-dows are now produced in a number of standard sizes. They offer a practical answer to heating heat-ing and air-conditioning problems when large windows are desired," American Builder says. Air Space Insulates A half-inch air space between the two panes of glass is recommended. recom-mended. This air space has high insulating qualities. The inner pane of glass holds the temperature tempera-ture of the room, while the outer pane stays at the outdoor temperature. tem-perature. In winter, double-glazed glass greatly reduces the amount of heat that escapes out through the window. In summer, the glass limits the amount of heat that can enter. American Builder tells home owners and prospective home owners that "double-glazed windows win-dows add comfort to a dwelling all during the year." Plate Glass 'Elegant' Polished plate glass is normally used for double-glazed windows, but other types of glass or combinations com-binations of types can be substituted. sub-stituted. The magazine says that plate glass adds "a note of elegance" ele-gance" to homes of modern design. de-sign. A special heat-absorbing plate . glass also is available to lessen heat transfer. This glass absorbs about 57 percent of the sun's heat, American Builder says. The glass is a fourth of an inch thick and is considered practical for windows win-dows on the east, west and south sides of houses, especially in warmer climates. |