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Condensation on double-glazed windows is common in winter, often due to high indoor humidity and insufficient ventilation. It occurs when warm, moist air contacts cold glass, forming water droplets. Persistent condensation can lead to mold growth, which poses health risks, especially for individuals with respiratory issues. Factors contributing to this problem include inadequate heating, poor insulation, and blocked airflow. Solutions involve improving ventilation, reducing moisture sources, and maintaining appropriate indoor temperatures. Regular airing and using exhaust fans during cooking or bathing can help mitigate humidity levels. If condensation persists, it may indicate seal failure in the glazing unit, requiring professional assessment.