Don't do it. I have seen it done. It fries the plant. My buddy stuck his bud in a food dehumidifier only for an hour and it wasn't even dry, but most of the thc had evaporated. It was crap and barely got u high. As for a regular humidifier, it would work, but the slower the dry the better. It won't take much longer to just cut the plant and hang upside down for 24 hours. Hang in a paper bag for a few days after that and its smokeable. I wouldn't dehumidify and ruin all my months of waiting and hard work just to save a day or two. Be a little more patient and ur virtues will be evident in the quality of smoke/high.