Indoor air quality and ventilation importance in cold weather

Maintaining proper indoor air quality is critical during colder months when windows are kept closed to retain heat. Daily activities such as cooking, showering, and laundry can generate eight to ten liters of water vapor per day in a four-person household, leading to high humidity levels.

Excessive moisture can cause condensation on windows, unpleasant odors, and the growth of mold and dust mites. These conditions pose significant health risks, particularly for vulnerable groups like children and the elderly. Inhaling mold spores and breathing in accumulated carbon dioxide can lead to headaches, fatigue, and respiratory issues such as asthma or chronic bronchitis.

Experts recommend short, intense ventilation sessions rather than leaving windows partially open for long periods. According to research from the DEIC Research Center at the VELUX Group, ventilating a standard bedroom three times a day consumes less than 0.5 kWh of energy for reheating. Modern solutions, such as electrically operated roof windows, allow for easier management of indoor climates without the need for manual intervention in cold weather.