I'VE SEALED THE WINDOW AND THERE'S STILL A DRAFT. WHY?

The space between the finished and rough frame of the window (hidden behind the window trim) is a major source of heat loss and hidden moisture damage inside walls. The trim should be sealed or removed and the gap filled and sealed if this was not done at the time of construction. Just stuffing fiberglass into this space will do little good. (search keyword "sealing" for the title " WHERE SHOULD I SEAL AND HOW?")