this evening I finally taped the poly in around the windows. As I was getting close to sealing it up and only had a few pieces of tape to go it was amazing how much cold air was channeling right to that last spot on the wall to get in while hot air must have been pouring out somewhere. Before I started putting on the poly the windows just felt cool all over. At the end their was a noticable breeze of cold air pouring out strong enough to bend a piece of paper.
If you are sealing up a house I'm sure anything is better then nothing but leaving two areas unfinished where a circulating loop can get going is going to result in a lot of cold air pouring in.
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