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How important is filling the space between two panes of glass with
argon or
krypton, compared to low-e coating(s)? Are two low-e coatings (on
different surfaces) twice as good as one? Does it matter which
surface the
low-e coating goes on?
One guy wants to sell me replacement windows with two low-e coatings
but
filled with air; another guy wants to sell me windows with a low-e
coating
and argon-fill (both claimed to have an energy star rating).
Are all low-e coatings the same or equally effective, or do I have to
ask
exactly what the multiple layers are?
Are triple-pane windows enough better than double-pane windows to
consider?
Thanks,
Larry