Attic ventilation is essential in making any home more comfortable while lowering energy costs. Air-conditioners can run less and won’t have to work as hard. Humid, stagnant air can be removed, drawing fresh dry air across the surfaces. Your attic can be drier and cooler–the perfect tools to help fight potential moisture damage. Attics get hot because your roof takes the full brunt of the Sun's energy. As the Sun beats down on your roof, the shingles heat up–reaching temperatures up to 150°F. This heat is transferred through the shingles, to the roof deck, to the lumber and rafters, and to anything else inside the attic. All of these materials will absorb and radiate the heat.
Lower air-conditioning costs.
Keeping your house cool can be a real challenge when your attic is too hot. The heat from the attic can find its way through the insulation or the A/C duct work to your living space, causing your air-conditioning system to run longer and work harder.
By lowering the attic temperature, you can save money on your cooling expenses. The exact savings depends on several factors such as the color of your roof, whether the home is shaded, the amount of attic insulation, and the efficiency of your cooling system. One scientific study conducted in Florida showed that powered attic ventilation resulted in a 6% reduction in annual home cooling system requirements.
Prevent the formation of ice dams.
Properly vented attics help prevent the formation of ice dams, which results in less damage to the interior of the house and longer lasting roofs. When heat from your home escapes into the attic, that heat can melt snow on the roof. This water flows down the roof, under the snow, onto the eave and gutter, where cold temperatures cause it to freeze. Eventually, ice accumulates and prevents additional snow melt from draining; it then backs up under the roof covering, resulting in leaks, damaged ceilings, walls, roof structure and insulation. Powered Attic ventilation helps maintain an even temperature throughout the attic, preventing hot and cold spots that can lead to ice dams.
Prolong the life of your roof–and your home.
Of all the reasons to ventilate an attic the most important is to preserve the structural integrity of the roof. At all times during the year, heat and moisture accumulate in every attic. When left uncontrolled, excess heat and moisture can result in significant damage to the roof and structure–reducing normal life expectancy. Proper ventilation validates some shingle manufacturers’ warranty and protects the investment in your home.
Remove damaging moisture from attic.
Cool evening air can create condensation that collects on insulation and wood during the summer. In the winter, moisture escaping from the home’s living space can condense in the attic on wood and insulation, which can lead to damaging rot and costly repairs. Wet insulation loses its effectiveness and can cultivate mold or mildew, cause stains or crumbled ceilings. A properly ventilated attic helps remove harmful moisture.