The most obvious reason for attic ventilation is to lower attic space temperature during the warmer months. Attic temperature can exceed 160 degrees Fahrenheit during hot summer days. Proper attic ventilation can reduce those temperatures by 50 degrees. No matter how much insulation is in the attic, heat can still transfer into adjacent living spaces. In fact, extra insulation can actually add to temperature increases because heat is trapped in the insulation. Proper ventilation evacuates this excess heat build-up. As the heat is exhausted, the work of the air conditioning system is reduced, thereby, saving energy and extending the life of the air conditioning system.