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Ben,
We had this issue last winter only mostly on the North facing 2nd level windows. Fortunately, not in the degree of causing warping and mold. I actually laid down a towel to catch the condensation to prevent any mold outbreak. We shall see what happens this winter. Incidentally, we've had no condensation this Summer. Our neighbors, the Ramirez's recently had mold and resealing of North facing 2nd level windows due to condensation. They were told it was due to improper sealing or lack of. You may want to ask if they are still having condensation issues.
I recently went on a construction tour and a builder educated me that aluminum windows (cheap and what builders are using now) were NOT a smart purchase due to the fact that they cause more condensation leading to warping and mold especially in the interior walls. Vinyl and wood are a better choice (more expensive), but would cut down on the condensation. A little condensation is normal though.
Marissa
Placing towel isn't the solution, you need to look for a permanent solution or talk to
mold removal expert to prevent mold.