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For Veg you want the humidity between 40% - 60%. For later in flower down in 30% range.
You don't have to use a heat fan, you could just use a regular fan to blow over the bowl or pot of water.
I just got one of those swamp coolers for $50 and not only does it blow out 12 degree cooler air onto my plants, it boosted my humidty from 30% to 50% in my veg box. It's really small too.
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