I assume you are asking because you are planning on some cold weather camping.
I cold weather camped 1 year. I have 3 windows that I wanted to see out of, but did not care if I could open or not, I used that shrink plastic you are asking about. Two of the three windows do not open at all, so there are no drafts from those windows. I don't know of a draft on the third window, but I put that plastic on it anyway. I believe it did a fairly good job in reducing the cold from radiating thru. My only problem was that the tape was a bear to get off the following spring. On the other windows I used that corrugated aluminum insulation which also worked fine. I had no issues with condensation on any of the windows.
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John, Joyce and Zoie (our 17# Guard Dog)
2018 Ford F-450 KR / 2019 Mobile Suites 40KSSB4
Fulltiming since 2008 and loving it
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