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Ours did not come with dual pane although we have them in our stick house. But at home we go from 110+ in summer to as low as 28 in winter so we need them. With the Monty I don't plan on being anywhere where they are needed. I have had enough real hot (worked in desert for 5 years @ 120+) and real cold (lived in Upstate NY for 10 years at -35+) to last a lifetime. On the 3400 if you have dual pane, the bedroom window does not have a screen. At least the '05 didn't so I'm glad we don't have them.
Happy trails..........................
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