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Our Montana is the first trailer of the four that we have owned that has dual panes. I don't know about all the numbers or manufacturer's claims or R values but I do know that this is the first trailer we've had that when I get up on a cold morning I don't have to wipe off all the condensation on the windows to see outside. There is also a noticeable difference in outside noise filtering inside. Much quieter. I'll never be without them.
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