THE 1973 ROOF THAT KEPT A HOUSE AT 70°F YEAR-ROUND WITHOUT AC OR A FURNACE
A decades-old roofing experiment showed how passive design could maintain indoor comfort without modern heating or cooling. 🌡️ Follow for more forgotten technology stories and comment your opinion below. #PassiveHouse #EnergySaving #SustainableDesign #NoAC #HomeTech
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