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並前往https://www.buildinggreen.com/news-article/how-read-those-darn-window-performance-stickers

How to Read (Those Darn) Window Performance Stickers

In a cold climate a good U-factor for a window is between 0.17 and 0.39. (That's between R-6 and R-2.5). Lower is better with U-factor--the ...

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