What is the best way to put window insulation on a window?
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https://home.howstuffworks.com/home-improvement/heating-and-cooling/insulate-windows.htm
What kind of insulation are you talking about?
If you are trying to see out but not let the cold in, I recommend this. https://www.google.com/search?q=scotch+window+film&rlz=1C1BLWB_enUS700US700&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjbxPmcipnYAhVG-lQKHe1KBgAQ_AUICygC&biw=1422&bih=684&dpr=1.13
If it's a window you don't need to see out of like a spare room or extra bathroom, bubble wrap is there to save the day and your heating bill.
https://www.google.com/search?q=bubble+wrap+window+insulation&rlz=1C1BLWB_enUS700US700&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjf4PXCipnYAhXHjFQKHQugD_oQ_AUIDCgD&biw=1422&bih=684&dpr=1.13
Here's a good tutorial-https://www.youtube.com/watch?v=PBQI3DJdfeQ