I live in ne ohio and temps range from really cold from dec. to april and really hot and humid in summer months. The insulation brand is the pink fiberglass blown type. They recommend no vapor barrier in the ceiling, however I will call again to make sure of their advice. The drywall is up and finished so, I cannot install a film now! We did what the insulation installer and insulation company suggested. Seems wrong to me,......but.. what now.?