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Sliding windows have one fixed window sash, and another that slides open from side to side. Unsurpassed energy efficiency, available with several “Low E glass” options. We offer a wide variety of screen, interior grid and color options. Preservation’s windows are beautiful, energy efficient windows. You’ll enjoy greater security and comfort with our Low E and Argon equipped Energy Star rated windows, savings on your energy bills, and years of worry-free performance. Backed by our dedicated service team, precise measurement, expert installations and spotless cleanup.