i have the enery star windows. the ones that can be opened and flipped out, or the top half or bottom half opened. anyway i was noticing that right in the middle, where the window latches are and the two halves meet, you can feel some air all the way across the center and center corners. it is that way with about all the windows in the house. what should i do to insulate this better while assuring that they will still work properly?