Well, my first partial boil extract batches I did in the kitchen and I really did not have any huge issues. Obviously it got pretty humid in the house, but I would just open doors and windows every once in a while and it would be OK. However, I mostly brewed when on days we were heating the house anyway, so it would be pretty dry in here already. I would imagine that in the summer on a high humidity day, it would not work well at all.
Now I do all grain, so full boils and I do that on a turkey fryer burner. So I boil in the shop now.