What Every Homeowner Should Know About Window U-Factor Ratings
How U-Factor Works In Real Homes U-factor is one of the simplest window performance numbers to misunderstand, because it sounds technical but describes something very practical: how well a window resists heat flow. The lower the U-factor, the better the window is at insulating. That matters in winter, when warm air tries to escape, and it matters in summer, when outdoor heat pushes in. An experienced window replacement company can confirm the cause with a quick
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