Permanently shaded glass at the top of the window is a significant source of heat loss, especially in cool and cold climates.

在窗户顶部的始终保持在阴影下的玻璃，是热量损失的重要源头，尤其在寒冷或严寒的气候条件下。

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Permanently shaded glass at the top of the window is a significant source of heat loss, especially in cool and cold climates.

在窗户顶部的始终保持在阴影下的玻璃，是热量损失的重要源头，尤其在寒冷或严寒的气候条件下。

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