A dehumidifier dries the air — it can’t drain standing water

A dehumidifier pulls water vapor from the air into its tank (30–50% RH). It can’t remove standing water — seepage and puddles are a drainage job.

Two side-by-side rooms. In the left red one, water seeps through the foundation wall and pools as standing water on the floor; a running dehumidifier can’t remove it, because bulk water is a drainage job — grade away, downspouts, a footing drain and a sump. In the right green one, water vapor drawn as droplets dispersed in the air is pulled into the dehumidifier and collected in its tank, holding a steady 30 to 50 percent relative humidity on the gauge. — Source: EPA/CDC 30–50% RH

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Two side-by-side rooms. In the left red one, water seeps through the foundation wall and pools as standing water on the floor; a running dehumidifier can’t remove it, because bulk water is a drainage job — grade away, downspouts, a footing drain and a sump. In the right green one, water vapor drawn as droplets dispersed in the air is pulled into the dehumidifier and collected in its tank, holding a steady 30 to 50 percent relative humidity on the gauge.

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