Proper attic ventilation allows a continued flow of outside air through the attic, lowering the temperature in the living space and protecting the efficiency of your insulation. For example, improper ventilation can cause attic heat to build in excess of 150 degrees. This super heated air eventually penetrates the ceiling insulation and moves into your living area below causing the temperature of your home to raise. In the winter with snow and ice freezing then melting the moisture level also becomes alarming. It is estimated that 9 out of 10 homes in North America do not have proper attic ventilation. Why? Because most people are unaware that attic ventilation can impact the longevity of their home and shingles. Installing an attic fan to help with your attics ventilation saves home owners up to 30% on their cooling bills, decrease temperatures in upstairs rooms by 10 degrees, lengthens shingle and insulation life with proper humidifier control and adds resale value to your home. So why take risks with your home? If you care about your investment make sure you have proper attic ventilation in the summer and winter.