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Marvin Integrity Windows has added a triple-pane glazing option to its Wood-Ultrex casements and awnings. The glazing uses three panes of glass, two low-e coatings, and argon gas fill to achieve U-factors of .18 to .20 (compared with .28 for the company’s best double-pane casement). The triple glazing is available on casements up to 3 feet wide by 6 feet tall. Prices range from $430 to $900, depending on window sizes and options. The company declined to provide a window-to-window price comparison with equally sized double panes, but did say that the triple-pane option makes the most sense economically in cold northern climates.

Marvin, 800/328-0268,