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@falconsportspack wrote:

Because the poptop curtain is thinner & not insulated like the body it will always allow more heat transfer into the van. I keep the flap facing west closed, & the other 3 open all the time. You'll never stop the heat boring through the curtain unless it's the one on the side of the awning/annex, & only then if those attach to the roof. It's also the complete opposite in winter. The curtain won't keep the cold out as well as a full height van. 

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Thanks falcons, appreciate it!