The Crafty Way to Outwit Window Drafts

Wind Over Roof Creates Pressure Suction Picture

On many cold, sunny days it would be great to air out your home without feeling a nasty cold draft from an open window. It may be essential to air out the house when you have just fried some bacon, and the kitchen exhaust fan can’t remove the odor. But if you open the window, you get a cold draft that only seems to spread the bacon smell throughout your home.

You can avoid this fate if you understand the basic science of wind hitting your home. The side toward the wind will be under positive pressure as air tries to push in. The downwind side will experience suction, and air will tend to move out of the window.

So, to quickly and comfortably ventilate your home, open a window on the downwind side. Air will move out of the open window as it leaks into the side of your home facing the wind. If you open a window on the windy side, too, air will flow in and out more quickly.

If you also open a window on the second story, the effect will even be higher as a chimney effect causes warm air to rise.

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