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The walls of a home typically represent the largest energy losses of any insulated assembly and, therefore, offer the largest opportunities for gains. Because the walls represent the largest surface area, they are most often the thinnest insulated assembly, in addition to having windows and doors in them. Since we’re unlikely to dramatically change the percentage of surface area between walls, floors, and ceilings, we should instead focus our energy on the things we can change: wall thickness and window and door performance.

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