Whether you're looking for new units to outfit an addition or replacements for your existing windows, the experts at This Old House sort through the options to simplify your search
An aluminum grille sits permanently between two glass panes, hinting at the look of actual muntins. The metal conducts heat, raising its U-factor and making the window less efficient. Cleaning is a breeze, but choose a grille color you like, because there's no changing it.
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