A whole-home humidifier adds moisture to the air during the heating season. They're common in cold dry climates (northern U.S.) where winter indoor humidity drops below 30% and homeowners complain of dry skin, static electricity, and woodwork cracks.
In coastal SC, winter humidity stays moderate (typically 40-55% indoors during the heating season). Whole-home humidifiers are rarely necessary here and can actually cause problems — adding moisture in our climate often pushes RH too high and creates mold conditions.
If you're considering one, measure indoor RH first with a hygrometer. Below 30% sustained = consider one. 30-55% = not needed. Above 55% = you need a dehumidifier, not a humidifier.
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