The easiest thing to do is check in the attic and look at the sheathing. If there is any mold growth, you can tread it with a proper mildewicide and make sure that the fan ducting is extended ... read more
Abe nailed the answer for you.
If the windows are due for replacement, look for a window with offset glazing or an option of laminated glass inside the standard set of windows.
Dedicated STC windows w ... read more