Good to know, since I will be revving up my little grow room for winter soon!
I'm basically working with a little attic type closet, it's about 5' by 4'. Walls on three sides, open in the front- I have to find a decent way to curtain it because NO door is gonna fit uless I spend about $300 on a custom built one!
The roof is slanted, too, just like any attic roof.
I will definitely be decorating it with something reflective, and the dollar store wrapping paper fits my budget about now! I have two 4' fluros, both are the Grow-light variety (cost a bit more but every little bit might help!) to begin with, I plan on adding a few more within the next month as I ready the room. It's VERY dry in there, so humidity will not be a problem!
I'm not an expert, but I did stay at a Holiday Inn Express last night.