I don't think it's either, I have great constant fresh air circulation, and I just transplanted(but they will be due again soon). I mist they curl an hour later they are better. The humidity is 25%throughout the house, it's winter and vewry dry here, so essentially I am sucking the accumulated moisture out, and replacing it with the dry air, but if I decrease my airflow the temp raises, so it might come down to weighing priority.