I’m most interested in a cheap option so the paragraph on “Industrial Blankets” caught my attention. But it didn’t give much detail or mention how carpet fairs in comparison.
As an experiment, I took mattress someone threw out and pulled the memory foam-like pad out, and stuffed that into my window, then hung a cheap normal blackout curtain with a drop cloth safety pinned onto that, then i have a thermal curtain hanging on a 2nd support track. It seems to work well although I’ve not tried it on a noisey night. Weekend is coming so maybe I’ll have a better idea next week.