Came in tonight and approached a male rep and said "It's very cold in my room...," and before I could finish my sentence, he laughed and replied "And what would you like me to do about that?" I haha-ed along and asked if there was something at HD that I could insulate the windows and doors with, to keep the coldness out, and I mentioned that a friend had told me about window treatments (plastic sheets)** that she and her husband had bought and used about fifteen years ago where they used a blow dryer to apply them. He said that there's really nothing to do except to install double-pane glass, and perhaps to use thermal strips to weatherproof doors and added that the treatments my friend told me about sounded "like an old wives' tale..." I thanked him for his help and moved on. I looked around the windows and doors dept. to see if I could spot those thermal sheets, but didn't find any.
**My friend texted a screenshot of a flyer advertising said thermal insulation sheets from Ace Hardware. Will try to look for them tomorrow.