I would go with a warm mist humidifier. All of the other types of humidifiers require a lot more maintenance to keep them running and to prevent bacterial growth. Warm mist humidifiers on the other hand boil water to create steam. This prevents bacterial growth and the only issue is sediment build up left behind by the evaporated water. running some vinegar through the humidifier every few weeks should prevent that buildup from becoming problematic. Another way to avoid the build up is to always use filtered/distilled water in the humidifier. I use water from a Brita filter or my RO/DI system and very rarely have to remove sediment buildup.
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