Central heating was developed in warm countries

Central heating was developed in warm countries. The Minoans of Crete (2700 BC – 1100 BC) devised a system of diffused heating. And around 150 BC the Romans developed the hypocaust system. This is how it worked:

Tile floors were supported by columns, creating a space beneath the floor where warm gases from a central fire could circulate and escape through flues in the walls.

That also meant a demand for well-made pipes – and thus the job of the plumber was created.

When the Roman Empire ended, widely people returned to the use of open fires for heating.