I applied bubble wrap to one window, using condensation already on the window to adhere it. It's really easy to apply.
I applied 1/4" bubble wrap to the storm window, then measured the temperature of the air gap between the storm window and regular window. It's a good thing I did, otherwise I would not have known that's a poor spot for bubble wrap in this case. This particular storm window lets a little draft through. The insulation brought an improvement, but when cold air blows right around it, insulation isn't terribly effective. The temperature in the air gap went up 2°F, and there's a 38°F difference between inside the window vs outside.
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