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When we were ordering our new rig we opted not to not spend the $1500. Being in the glass business for the last 35 year I knew the minimal airspace on these windows does little for insulation, noise yes but pretty pricey noise mitigation.
For good insulating you need minimum 1/2" airspace and these windows are less than 3/8".
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Les and Sue Young, 2009 Int 4400 LP, 2020 DRV Mobile Suites [/url] https://ramblingrvrat.blogspot.com/2019/11/freedom-from-grid-rambling-rv-rats.html[/url]
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