Questions tagged [u-value]

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How to find a very low U-value replacement window for a bathroom?

I found 0.27 for a Pella 250 series at Lowe's. I would like to find a window with a lower U-value. How do I go about that?
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Where can I find the U-factor (U-value) for a Pella window?

I am trying to compare the Pella windows sold by the Pella sales person with the Pella windows sold at the big box stores (Lowe's, Home Depot). I have found a spec sheet with this information for ...