Overview
- Consumer group Which? advises opening windows or vents each morning to let moisture escape and suggests a water–white vinegar spray with a little washing‑up liquid to help reduce droplets on glass.
- Experts also recommend Stoßlüften, or shock ventilation, by opening all windows for around 10 minutes in autumn or five minutes in winter twice a day to rapidly expel humid air.
- When drying clothes indoors, use a bathroom with the heater on and a humidity‑controlled extractor fan, and keep lids on pans and run the kitchen extractor—or open a window—while cooking.
- Guidance stresses maintaining stable indoor conditions, with a target of about 19 °C in well‑insulated homes and relative humidity between roughly 40–60%, while avoiding sudden temperature swings.
- Structural factors raise risk, with older solid‑wall homes widely lacking insulation, and households are urged to check window seals and glazing warranties and consider dehumidifiers if condensation persists.