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I spent several years selling and installing residential replacement windows. There is a huge difference between "dual pane" RV windows and residential windows. The RV windows are not filled with argon gas and other additives to keep them insulated and protect from UV damage. They are certainly sealed but do not have nearly the R value of high quality residential windows.
Do dual pane RV windows allow your RV to heat/cool better? Possibly by up to 5 degrees better. Do they keep outside noise out? They will make a difference sure. If you make your decision based on the knowledge that they are only slightly better than regular RV windows then you will probably be happy with them. If you base your decision on thinking they are the same high quality as residential insulated windows then you will be disappointed.
If I was purchasing new and the option was offered for around $500 I would probably add it, anything much higher would be a waste of money IMHO.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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