This winter in the USA, a simple solution is gaining popularity: placing bowls of salt on windowsills to combat humidity. This easy, accessible method is intended to reduce mold and condensation buildup in homes. But is it actually effective?
Condensation occurs when water vapor in the air contacts a cold surface, like a window, turning into liquid water. This not only causes discomfort but can also promote mold growth and damage window frames. Along with proper ventilation, some are trying additional ways to control moisture.
Tips for reducing moisture at home
- Using air conditioning and ventilation systems: In cars, air conditioning effectively dehumidifies the air, preventing condensation buildup. At home, opening windows and using fans can be essential to lowering moisture levels.
- Placing salt containers near windows: Salt, known for its moisture-absorbing properties, can slightly reduce condensation. However, its effectiveness is limited, only activating at humidity levels above 74%. A small container with salt near windows in particularly humid areas may help.
- Ventilation in critical areas: Spaces like bathrooms and kitchens often have higher humidity. Installing vent grilles or opening windows helps prevent condensation on cold surfaces, especially during winter.
- Hygroscopic surfaces as an alternative: Some materials, like calcium chloride, are highly hygroscopic and absorb moisture more effectively than regular salt, making them an alternative in very humid conditions.
Although placing salt near windows can help in some cases, it’s not a definitive solution. Ventilation remains essential to controlling moisture and maintaining comfort. Every home is unique, and combining different moisture control methods may be the key to preventing condensation and mold during colder months.
