There are a few things you may look for to see if your basement requires a dehumidifier. Look for any leaks or areas where water is entering. This is where the dampness comes from. If your basement is humid, it may be due to a lack of ventilation. Another sign that you need a dehumidifier is the presence of mold in your basement. Condensation on the walls indicates a high level of humidity in the basement. This means you need a dehumidifier.
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