Cross ventilation keeps the air from staying put and becoming stale and warm. Allowing the air to flow throughout the house keeps the interior healthier, cooler and more enjoyable.
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The air that's lower to the ground is going to be cooler. So having some awning windows down low that can capture this air will keep the house interior cooler.
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Increase air circulation. Operable windows, especially those that are properly shaded, can keep the interior nice and cool. Windows such as these transom types can be left open at night to let in the cooler evening air.
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An easy way to create the chimney effect is to put an operable skylight above the stairway. When open, the skylight will draw the cooler air from the lower floors up, keeping the top floor cooler in the process
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