When it comes to attic ventilation, one should be like Goldilocks and find a balance of ventilation that is just right. If your home is over-ventilated, it can make your attic space chilly and drafty. Over-ventilated attics do not combat moisture buildup, so they are prone to water damage. An over-ventilated attic can disrupt the natural airflow in the room and cause the same problems as a poorly-ventilated attic, including: - Increased energy bill costs - Moisture buildup - Bad airflow - Ceiling or roof is sagging - Mold growth - Spongy roof - Frost