Overview
- Recent coverage published Thursday consolidates practical, room-by-room guidance that adapts ventilation to the autumn transition rather than using one fixed rule for every space.
- Unheated basements can get wetter if aired on warm, humid days so ventilate them in the early morning or evening when outside air is coolest and drier.
- After showering keep the bathroom door closed and immediately Stoßlüften through the window, and install mechanical extraction that meets DIN 18017-3 where the bathroom has no window.
- Measure with a hygrometer and act on thresholds: aim for 40–60% relative humidity, keep poorly insulated homes under about 50% in winter, and treat sustained readings above ~70% as a mold warning; place the device away from radiators and cold walls.
- If ventilation cannot control moisture, use a compressor dehumidifier as a fallback knowing real drying power falls with lower temperatures and that typical units draw about 200–300 W and cost roughly €13–€20 per month at six hours daily, while humidifiers and evaporators need regular cleaning and care to avoid microbial risks.