I have a 17 month old who shows signs of possible asthma, or at least he did last winter. I want to invest in a good humidifier for his room for the winter, but am having trouble deciding. For those of you with little ones with asthma, have you found it more beneficial to use evaporative or cool mist? I am trying to eliminate the white dust, and from what I've read that seems best done with the evaporative type. But on that note, it is my understanding that cool mist may be better for them. Any advice, suggestions or experiences? Thanks in advance.