Condensation is a persistent problem associated with windows, especially in San Francisco. In cold climates, condensation collects on windows when the temperature of the glass drops below the dew point of the inside air.

Minor sweating is normal with most windows, but excessive condensation can contribute to the growth of mold or mildew in or on the walls, damage paint surfaces, and eventually rot wood components.

Newer double-paned windows can reduce condensation because interior glass surface temperatures are warmer. In a home with older windows, the simplest and most effective way to control condensation is by reducing interior humidity. Using vent fans (in the kitchen and bathrooms) and dehumidifiers also helps lower interior humidity levels.

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