Does a bowl of salt help condensation?

Can a Bowl of Salt Help Fight Condensation?

It might sound like an old wives' tale, but there's a bit of science behind placing a bowl of salt near a window to combat condensation. Salt is hygroscopic — meaning it naturally draws moisture from the air around it. On cold nights, especially near poorly insulated or single-glazed windows, warm indoor air meets chilly glass, causing water vapor to condense into droplets. This is common in small rooms like bathrooms or bedrooms.

A bowl of salt won’t replace a dehumidifier or proper ventilation, but it can offer a small, temporary reduction in surface moisture. As the salt absorbs some of the humidity in the immediate area, less water may settle on the glass overnight. It’s not a complete fix, but in a pinch, it’s a low-cost, no-fuss trick that leverages basic chemistry.

That said, while salt may help slightly, long-term condensation issues usually point to deeper problems — like poor airflow, high indoor humidity, or inadequate insulation. Solutions like using extractor fans, opening windows when possible, or upgrading to double-glazed windows tend to be far more effective. Still, if you're curious, leaving a small bowl of rock salt on the sill won’t hurt — and might soak up just enough dampness to make a subtle difference.