Well I don't know if it will make your freezer work more efficiently but I have heard that people with very fitted designer jeans are encouraged to deep freeze jeans for a couple of weeks to rid them of bacteria and odor instead of washing them. It's to keep the integrity of the shape of the jeans and denim. So I don't think the freezer will harm your quilts even if you didn't wrap them up. When I had a deep freeze when supplies got low I would keep gallon jugs of water in it to keep it more full and working better.