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High-Efficiency Envelope: Windows and Insulation

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A lot of the world’s greenhouse gas emissions come from the energy we use to heat and cool our buildings, with the amount of heating and cooling a building needs to maintain a certain climate condition being in large part determined by the building’s envelope—that is, its walls and windows. The more heat that passes through building walls and windows, the more heating or cooling energy we need to use and manage. Extremely inexpensive high-thermal-resistance wall insulation and low-thermal-loss or dynamically adjustable window technologies present a real opportunity to reduce total energy use in buildings and attendant greenhouse gas emissions.