i just use 3 fans. if its a really hot day or just generally hot in there instead of dry ice just get a bucket or large bowl and fill it with regular ice and cold cold tap water. then face the fan directly down onto the water. (i use clip desk fans but any moveable fan will work). this will make the cool air blow throughout your room. much easier to get regular ice since dry ice requires a special trip to a store and also the water is still quite cold even after the ice melts so that you dont have to be to concerned about changing it until it becomes room temp. it also might help with the humidity issue. as putting water in the grow area typically boosts the humidity!
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