My humidity doesn’t always go down with tent open. Not sure but think it maybe due to dewpoint has stayed over 70% for two months. I’m in a state that normally doesn’t have rain from July to end of October but this year it’s rained hard two days at least every week. Also due to heat issues (heat index 110°) lights come on at 8pm off at 8 am & they’re in my bedroom. Before I got the cool tube the room was like trying to sleep in jail due to light and having vents open