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High
Performance Insulated Glass Choices
In general,
the better a window's insulated glass package, the better it will
provide energy savings and comfort.
One caveat
however, don't be fooled by some manufacturers' focus on the insulated
glass "R" factor alone. Instead, look at the certified NFRC "U"
value for the entire window unit. The lower the "U" the better the
window will insulate. For the best in insulating values today,
look for an NFRC Certified Double Hung Window "U" value of U-17 or
below.
According to
the U.S. Department of Energy's guide for Selecting Windows for Energy
Efficiency, "The insulating value of an entire window can be very
different form the Glazing (glass package) alone.
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