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The warmer the air, the more water the air can hold. With this in mind, the air in the center of any given room will hold more water than the air on any outside wall (where there are windows).
the warm moist air moves toward the cooler window on an outside wall, the
moisture-laden air becomes cooler and cannot hold the moisture it held when it
was warmer. When moisture-laden air is cooled, it appears as water on the glass
and frames of windows.
condensation occurs more frequently during the winter months when the average
outdoor temperature drops to 35 degrees or less. Maintaining a lower relative
indoor humidity will assist in preventing window condensation in colder
Ventilation is also a very effective way to remove excessive moisture from the air which is why old, poorly insulated homes with single glazed windows oftentimes do not have condensation problems. The source of ventilation is the air infiltration around the windows.