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It has often been said that windows are the eyes of the home, allowing the occupants the opportunity to observe what is happening outside. But window functions don't just end there. We rely on windows for natural lighting, ventilation, as emergency exits, and as an integral component of the architectural style of the home.
In calling on windows to perform these many functions, we still expect our windows to be inexpensive, easy to operate and maintain, durable and attractive – and energy-efficient. Improving energy efficiency reduces greenhouse gases that contribute to climate change. Because they are called upon to perform so many functions, it may be difficult for windows to do all of them equally well.
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