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Re: energy-efficient windows

My guess is that a triple-pane window
would be the best way to keep the "heat
losses" low in very cold environment. Not
pushing the inside temperature too high
should also be very helpful.

Low-e coating (high-r) of the inner-most
pane might help but the low-e coating of
the outer pane will probably have very
small contribution to your winter economy.
Remember the T^4 law. The warmer the
surface the more effective the low-e
coating is likely to be. But having no
experience in this field I am only

Are thermal conductivities of Ar and Kr very
different from the k of air? I do not know.
Ludwik Kowalski

On Saturday, Feb 21, 2004, at 17:52 America/New_York, Larry Smith wrote:

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
filled with air; another guy wants to sell me windows with a low-e
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
exactly what the multiple layers are?

Are triple-pane windows enough better than double-pane windows to