I am a college student living in a cheap rental. I have a window in my bedroom that leaks a lot of cold air. I live in a northern climate, and during this recent cold snap my heater can't keep up. The window is in a recess and I currently have a thin curtain covering the window. The window looks only on the side of a neighbor's wall.
Would it be a stupid idea to buy insulation to stuff into the recess and prevent cold air from leaking, and would it be effective? I've been researching and others have suggested thin plastic window covering but this doesn't seem like it would greatly improve the situation. A few drawbacks I can see to my idea is that it would obstruct the view which I don't care about and would not let any sun in which might effect my sleep.