I have been using fleece for years now to cover doors in the garage to help stop some of the cold. We have a door in the kitchen which goes directly into the garage. Man, is that ever cold. The fleece really does help. I also hang fleece between my drapes and the slider in the dining room. It has made a big difference. I am in the process of making quilt wall hangings to help insulate the walls. It's been very cold & we're feeling the cold as we get older. Hopefully, these quilts will help. I've never used plastic on windows, so I can't compare the plastic to the fleece.