Am replacing Rivco Windows, need to understand what U-Value means?
Goal: Windows get all afternoon sun and I'm trying to block as much UV as I can. Problem with existing windows is that Sun is damaging family room furniture. Rivco makes a Low E Argon Gas filled replasement sash that has a U-Value of 0.35.
What does that mean? that it blocks 65% of the UV rays?
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