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Featuring a beautifully refined silhouette and advanced energy-saving technology, our <br />4000 Series delivers exceptional style, strength, energy efficiency and value — everything <br />today's homeowners are looking for in a quality replacement window, and more. <br />Both sashes of Window World <br />Double -Hung Windows tilt in <br />for easier, safer cleaning from <br />inside your home. <br />This next -generation 4000 Series is precision -engineered to meet or exceed stringent ENERGY STAR® <br />requirements, providing triple -pane energy-saving performance in a dual -pane unit. The dual -pane, <br />double -strength insulated glass, thermally optimized frame and sash and non-conductive composite <br />reinforcements are just part of the advanced energy engineering that puts 4000 Series Windows in a <br />class all their own — premium window performance with everyday affordability. With Window World <br />Windows your home will have a fresh, energy-efficient, low -maintenance solution backed by a <br />lifetime limited warranty.* <br />