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Window technology has changed dramatically in the last 25 years, first with the introduction of insulated glass, then with new frame materials such as vinyl and clad wood, and again when high-tech coatings began to make windows even more energy efficient. Residential Windows: A Guide to New Technologies and Energy Performance ($22 from W.W. Norton & Co., Inc., 500 Fifth Ave., New York, NY 10110; 800/233-4830; www.wwnorton.com) can help both builders and their customers make informed choices when trying to find the right window for the job. Drawing on research done at the Lawrence Berkeley National Laboratory, authors John Carmody, Stephen Selkowitz, and Lisa Heschong pack six chapters and five appendices