Which size dehumidifier do I need for my home? The size of the dehumidifier you need depends on the size of the space you want to dehumidify. A general rule of thumb is to choose a dehumidifier with a capacity of 1 pint per 1,000 cubic feet of space. For example, a 50-pint dehumidifier is suitable for a room with 50,000 cubic feet of space.

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