I'm renting a bedroom in a house with very thin walls, and when I wake up every morning, it's freezing, and I imagine that will only get worse. I was thinking it would be nice to come up with some way to add insulation to the cold exterior walls. My problem is: I'm not allowed to drill the walls, and I don't want it to look terrible.
My initial plan was to get some kind of insulation, set it into a lightweight wooden frame, and then stretch some fabric over it to make free-standing insulating panels that look nice and (hopefully) provide some insulation. I do have a few concerns, though, and not enough DIY expertise to know the answers, so I was hoping you folks might help me out.
Would this even help? If I'm not completely covering the walls, floor-to-ceiling, am I going to see any benefit?
What material should I use in the frame? I was thinking the appropriate material would be rigid foam, but now after reading up, I'm worried about offgassing, toxic flame retardants, HBCD, CFCs… and many other things I don't really understand. Is there a rigid insulation material that would be safe to use in an interior room as part of a free-standing panel? Polysio? XPS? Mineral wool?
Also, if this is too newbie a question, or if I'm reinventing the wheel, please feel free to close the question or redirect me to a more appropriate resource.