We use the brand Levoit humidifiers from Amazon. One small one (2.4L) can boost the humidity levels in a bedroom by at least 10% pretty quickly. They are the cool mist vaporizers. Nothing fancy, only about $35.
We live in a pretty humid area so I don't need to use it much and only need to refill once a day. No white deposits or anything but I think that depends on the water where you live.
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