I have lived many winters without ever needing to put plastic insulation over my windows. If this sentence makes no sense to you, well, congratulations on not living in shitty or old apartment or house in a frigid midwestern or generally northern US state. Or, you know, anywhere else in the world where the outside doesn’t get so cold in the winter that it can leech through every exterior surface of your dwelling to steal every drop of warmth you posses but also so warm in the summer that an unattended egg can cook in thirty minutes of sunlight or less.