>I’m taking 500+ years ago.
That’s not even very long ago, architecturally speaking. Just google something like English houses of the 1500s and you’ll quickly realize that not only do they look more or less like a modern house, but some of them *still exist and remain in use.*
In the case of my example, they were stonev and timber with plaster internal walls, much like today, just with different specific materials. They had fireplaces for heat, and sometimes vents in walls and floors to circulate that heat and reduce the need for fires in every room. Hot air and cold air will naturally move on their own as they displace one another, even without modern fans. Larger, wealthier houses certainly had several fireplaces anyway.
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