I use something that slides under the doors to block drafts and it works really well. Not sure what they are called or where dh picked them up. My front door is incredibly drafty - it has small windows around both sides and it really lets all the cold air in. There are doors on either side of the front entry to the living room & the master bedroom. We have them under those doors, and it really helps keep out the cold from the entryway. I just put them back on last week.