I wanted to share w/you what I found to cover up my vents/registers during the winter months. I was searching for a product that would close off my vents during the winter and up until this past winter I found nothing. I came across a company that make Insulated Magnetic Register/Vent Covers. The company; Elima-Draft Inc., makes them and they work great. They are made of ABS with layers of insulation. Nothing like the flat magnetic ones which don't work. I believe I've saved money during this winter on my energy bills as well as stopping cold drafts. They are on the web and sell on many on-line sites. Just wanted to share with you. Hope this helps
Cooper10 This site is great for info and help. I've used some of the suggestions.