Putting bowls of salt on window sills to get rid of humidity is becoming more popular in the US this winter. This simple, easy-to-find method is meant to keep homes from getting moldy and damp. But does it actually work?
When water vapor in the air hits a cold surface, like a window, it turns into liquid water. This is called condensation.
This is not only uncomfortable, but it can also help mold grow and hurt window frames. Some people are trying more than just good ventilation to control moisture.
Tips for reducing moisture at home
Using air conditioning and ventilation systems:The air conditioning in cars effectively removes moisture from the air, which stops condensation from forming. When you are at home, opening windows and using fans can help lower the humidity.
Placing salt containers near windows: Because salt is good at absorbing water, it can slightly lower condensation. But it is not very useful because it only works when the humidity level is above 74%. In places that are very humid, putting a small container of salt near the windows might 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 substances, like calcium chloride, are very good at absorbing water, which means they can be used instead of salt when it is very humid outside.
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