Apart from insulation, ventilation is an important element in a home's energy efficiency. Attic ventilation is usually not synonymous with lower cooling bills, but it should be. Many people simply choose not to concern themselves with attic vents and the many variations of them: rectangular, hooded, etc. One reason to think about ventilation, however, is a homeowner's comfort level; did we also mention reduced utility bills? Improving ventilation can surely lower energy costs by relieving excess strain on an air conditioning unit.