Why Japanese Houses Stayed Cool in 100°F Summers While Modern Homes Trap Heat

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Picture a heatwave. It's a hundred degrees outside, and not the dry kind. This is wet heat, the sort that sits on your skin like a damp towel and refuses to move. Now picture the power going out. In a modern apartment, sealed behind double-glazed glass and a foot of insulation, you have maybe three hours before the inside catches up to the outside and keeps climbing. By nightfall it's an oven, and you can't open it, because the windows were never really built to open. Seven hundred years ago, in the merchant streets of Kyoto, people lived through summers just as brutal in houses you could almost see straight through. Wood, paper, and woven straw. No glass, no machine humming in the wall. But those houses stayed cool. So how did a house made of paper beat the sealed, climate-controlled box you pay to live in today?