Take two tubes from the inside of wrapping paper. Cut them to about 1/2 inch shorter than the door and stuff them with news paper or junk mail. Put them inside one leg that has been cut from of a pair of nylons. Make sure it fits properly before tying the end off.
You can slip them under your door with one tube on each side. The door will slide easily back and forth. I use it on rooms that I don't need to be continuously heated. Not sure how it would work on carpet but I have hardwood floors.
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