Not sure if RV dual panes are gas filled, but good home units that are gas filled will last longer than a few years. A company like Andersen Windows have a 20 year warranty, some cheaper window company have a far shorter warranty some as low as 5 years.
We've had dual pane on all our RV's and only had one problem that was covered under the 2 year glass warranty that the RV window company had. We like the option, not only does it help for heat and cold, but helps reduce noise.
Jim & Jane
2008 Cardinal 30TS
Trail Air Pin Box, Air Suspension, Smartair Air Spring Self Leveling, Reese Signature Series 18K hitch
2008 Chevy Silverado 2500HD 4x4 Duramax/Allison Ext Cab Long box Use And Promote CB Channel 13
I ordered thermal paine windows on my Jayco TT they are worth every bit of the $1200.00 it cost. I have no water condensation inside on them its quieter inside and it insulates from the outside. The window frames are built better than the single paine to handle the extra weight. Though I would not retrofit a unit that does not have them the cost would be through the roof. You would be better off trading unit in for one that has option. JMO
2004 GMC 1500 4x4 Extended cab short bed 5.3 3.73
2007.5 Jayco 328RLS
"Are the dual pane windows in an RV gas filled like those on a site built home or are they just two panes of glass sandwiched together with a dead air space in the middle?"
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