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Factors to consider:
For your family's optimal health and comfort, your home's relative humidity levels should range from 30 to 50 percent in the winter and from 40 to 50 percent in the summer. But keeping humidity at these levels often demands mechanical assistance. For example, on sultry summer days, when indoor humidity rises above the comfort range, many people turn on air conditioners or dehumidifiers to help dry the air. And when the dry winter heating season sets in and drops relative humidity to skin-chaffing lows, boosting the humidity usually calls for a humidifier.
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