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A hot second floor in July and frost on the roof deck in January usually point to the same problem: attic ventilation that is missing, undersized, or badly balanced. Homeowners often notice comfort issues first, but contractors and technically minded buyers know the bigger concern is system performance. When air movement through the attic is wrong, you can end up with trapped heat, moisture accumulation, shortened shingle life, and insulation that never performs the way it should. What attic ven …