One area where the project developers needed to buy more expensive equipment was windows. Instead of leaky sliding windows, these new casement units will be able to close tightly and they have an R-value of 5 compared to 1.3 for the older windows. The window frame is fiberglass, rather than metal, which means that it can't act as a thermal bridge, or conduit for heat loss.
May 23, 2011 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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