I have used it during the summer 70-90degrees 50-80 RH,Thanks folks. The reviews I read everywhere makes it sound like it just works, which is what I need. It's normally in the 90's during the summer and high 70's to low 80's with humidity 65%ish here. I've tried drying in my tent, closet and even tried drying in a frost free fridge and got that hay smell every time. What were your ambient temperature and humidity conditions when you used the herbsnow dryer?