How did castles stay cool in the summer?

The towers featured small windows, designed to capture gusts of wind and funnel them into the building below, like a clever wind-powered fan. Medieval Castles kept cool during the summer due to their thick walls and high ceilings.



Castles stayed cool in the summer primarily through thermal mass and passive design. Their massive stone walls, often exceeding 2 to 3 meters in thickness, acted as a "heat sink," absorbing the warmth of the sun during the day and keeping the interior temperatures stable and cool. Because stone takes a long time to heat up, the internal temperature rarely fluctuated, creating a high-value "natural air conditioning" effect. Furthermore, castle builders utilized cross-ventilation by strategically placing narrow "arrow slit" windows on opposite sides of the structure to pull in breezes. Stone floors were often covered with damp rushes or herbs like lavender and mint, which cooled the air as they evaporated. In 2026, architectural historians still admire these medieval techniques, noting that the "Great Hall" remained the coolest spot in the fortress due to its high ceilings, which allowed hot air to rise far above the inhabitants. This natural cooling was so effective that even in the height of a European summer, castle dwellers often had to wear wool robes to stay warm indoors.

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The bioclimatic function The remaining hot air was refrigerated using wet sheets hung beneath the ceilings of the rooms on the upper floors. There was also a large tank situated in front of the castle and collecting the water flowing from the internal fountain.

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Castles and manor houses often smelled damp and musty. To counteract this, herbs and rushes were strewn across the floors.

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Asides from normal body odor, it would depend. Bathing was more common than people nowdays think and most Medieval people tried to keep clean as much was reasonable. A richer noble or merchant might also use perfumes or other such things to smell nicer while others would likely smell of their surroundings.

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The toilets of a castle were usually built into the walls so that they projected out on corbels and any waste fell below and into the castle moat. Even better, waste went directly into a river as is the case of the latrines of one of the large stone halls at Chepstow Castle in Wales, built from the 11th century CE.

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Architecture played a big role in keeping homes cool. By creating archways, large windows, and high ceilings, builders could funnel in outdoor breezes and create cross-ventilation. Porches built in the shade also gave people an area to cool off during the evening.

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After the 16th century, castles declined as a mode of defense, mostly because of the invention and improvement of heavy cannons and mortars. This artillery could throw heavy cannonballs with so much force that even strong curtain walls could not hold up.

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By the 1600s, people didn't want to live in cold and damp castles anymore. Kings, queens and noble men wanted to show off how important and rich they were so they built palaces and great houses. Many existing castles were replaced with much grander homes.

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Washing and Bathing Was Very Uncommon In medieval times, the wealthy would take a bath every other month. If you were poor, you'd be lucky to bath 4 times per year. There was no hot water so it had to be carried in through a well and then heated over a fireplace.

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