A passive house design from the 19th century helped heat buildings during the winter, but now, scientists from Sweden have adapted this so-called Trombe wall method to also cool a home.

Using renewable wind and solar energy, the design allows the wall to generate both heating and cooling in buildings, which also prevents the over-heating problem some have experienced in the past. The wall is built from stone, wood, wool, and glass and can be integrated into modern design.

The adapted Trombe wall is currently being tested by local residents in Egypt to see just how well the cooling works on a desert-hot day.

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