Venting: Soffits
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Keeping your attic cooler in the summer can increase the life of the roof as well as saving money on your air conditioning bill. To effectively cool the attic, outside air needs to circulate through it. One solution is to use the natural circulation caused by hot air rising to bring fresh air into the attic through soffit vents under the eaves, then expel the hot air through ridge or gable vents near the peak of the roof.

Be sure to couple these soffit vents with gable vents or ridge vents,  wind turbines, or power vent fans to ensure a good circulation of air throughout the attic.
There are several different types of soffit vents available including continuous, circular, and perforated vents made for vinyl siding.

In general, aim for at least one square foot of vent space for every 150 square feet of attic area.
sources: dannylipford.com/adding-soffit-vents/
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