I would thumb tack quilts up over our sliding glass doors when we lived in an apartment. Also thumb tacked lighter weight blankets over the blinds in the bedroom windows. They were easy enough to remove, but added a lot of warmth to the apartment.
My mother has heavy duty plastic sheeting on lightweight frames that were built to just slip into the inside frame of the windows. She stores them in the warm months and then just pops them into place when it gets cold.
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