Andersen is one of the leading manufacturers and marketers of windows. Renewal by Andersen windows are available in multiple replacement and new-construction lines in widely sold double-hung and casement styles, as well as bay windows. Andersen window lines include wood, clad, vinyl, and composite construction, and also low-emissivity (low-E) and argon-filled (gas-filled) glass for high efficiency. The company markets a line of stock sizes and has extensive special-order and custom options. Its windows are widely available through independent home centers, dealers, and Home Depot. Andersen also markets a line of composite windows under the Renewal by Andersen name through certified installers.