I have learned that during the wintertime in my new house, with the attic grow rooms having no insulation between them and the metal roof, I have a problem. When I raise humidity and temperature upstairs and it is much colder outside it can actually rain inside my grow area! Well, maybe not clouds and lightning and all that, but I get condensation above my ceiling because of the difference in temperatures and the high humidity from the grow rooms and enough water is collected, especially on watering days, that it drips from the ceiling in various places around the attic. Luckily there is a bit of a slant to the room up there, or I would be very worried about drips falling down into my lights, and it turns out that just by sheer luck I located all the lights on the high side of the room. This problem will go away when the warmer temperatures return, but before next winter I need to blow some insulation in between the peak of that metal roof and the interior ceiling or this little problem is likely to cause some real damage to my house.