passive cooling

What happens when you leave a gap in closed shutters during a heatwave

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I always lowered my shutters all the way down during heatwaves: the day I left a small gap open, I understood what the dar...

For years, closing shutters completely seemed like the obvious way to beat the heat. But one forgotten gap revealed a counterintuitive truth: sealed shutters create trapped pockets of superheated air that radiate directly into your home. A simple thermometer and strategic ventilation can transform your summer comfort without air conditioning.

Do closing shutters keep a house cool in a heatwave

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Why Your Grandmother Closed the Shutters at Noon: The Science Behind Her Summer Cooling Secret

For generations, European grandmothers have relied on a counterintuitive summer trick: closing shutters and blocking out the sun. When a brutal heatwave tested this wisdom, the results were undeniable—her sitting room stayed several degrees cooler than the street outside. Here’s the science behind why windows are actually radiators, and how to harness natural cooling.