Home Improvement Specialist
Rehabbing homes for 25 years.
Not an active Expert
I also forgot to mention that if you have single pane windows instead of insulated double pane, or if you have aluminum window frames, you will sometimes get ice build-up on the inside of your windows. This can eventually cause your windowsills to rot creating bigger problems. Like I said in my post above, I used a dehumidifier which solved the problem.