If you get some of the bubble wrap that is used to cushion breakables in transit then
Wash your windows and put the bubble wrap on the wet window pane. It will let in light but will keep the heat and cold out somewhat.
That's cool, I never heard of that!
I used to live with drafty windows myself, until the landlords replaced the old sliders with new modern windows.
Sometimes, in winter, I would have ice along the
inside of the window! Brrrrrr!