Dual-pane windows are manufactured with two sheets of glass separated by a layer of inert gas. This design reduces energy costs, condensation, and color fading due to sunlight, and increases the overall comfort in the home.
dual pane
Tools to help you pick your energy-efficient windows | 30 Mar '07 from the editors
Replacing old windows with new, high performance, energy-efficient windows can be pricey. And, once you do decide that the long-term energy-savings are worth the initial investment, swapping those single-paned energy-suckers with dual-pane (or even triple-pane!) replacements can be a complicated process. The options are endless. Do you want the window glass (called glazing) clear or with a bronze tint? Do you want aluminum framing or wood ... or maybe even a hybrid composite? And what type of gas would you like between the panes? Argon or krypton? And how about a low-E coating? It's almost as complicated as ordering a double, half-calf, non-fat, vanilla latte at the corner Starbucks. But, it's worth it!

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