Triple-pane vs. Double-pane windows in SIPS home
Aluminum is a thermal conductor, but wood and composites are going to
have good R value. Even so only aluminum would figure into a degadation
that shows in U values, the overall window rating. I hope aluminum is
not being considered that far north, as all aluminum I see are realy U
rated for southern areas. But true 50% of the loss can be the frame.
|