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Again, a dual pane does not have to have 'gas'. In fact, 99% of them only have plain 'ol air.
Typical window r-values. (This is with vinyl frames, aluminum are less)
Single Glass - 0.91
w/storm - 2.00
Double insulating glass
(3/16") air space - 1.61
(1/4" air space) - 1.69
(1/2" air space) - 2.04
(3/4" air space) - 2.38
(1/2" w/ Low-E 0.20) - 3.13
(w/ suspended film) - 2.77
(w/ 2 suspended films) - 3.85
(w/ suspended film and low-E) - 4.05
Triple insulating glass
(1/4" air spaces) - 2.56
(1/2" air spaces) - 3.23
Addition for tight fitting drapes or shades, or closed blinds - 0.29
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Hybrid Mode
