I used black electrical tape on both surfaces for continuity.
I have deduced the bubble wrap is actually a super conductive heat sink. (and gets wet)
The increased surface area caused by the bubbles does bad bad things for you , lol ,
if the bubbles were enclosed with a second piece of plastic there would be some benefit.
Air is much less conductive then plastic so having a large enclosed air space is more effective at insulating then the bubbles air space.
If you add poly plastic over your window frame it would give you approximately 3" of air space which equates to R1 in insulation value. Add a heavy curtain and you will add another R1 or R2
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