They built chambers underneath the floors. Fires were built and the heat would fill the chambers under the floor. This would create radiant heat into the rooms from the floor.
These were called hypocausts.
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Because they had air flow central heating (a hypocaust system) and the fire had to be in the place where that was and where the bathwater was heated,
Central HeatingCentral heating appears to have been invented in ancient Greece, but it was the Romans who became the supreme heating engineers of the ancient world with their hypocaust system. Central heating was adopted for use again in the early 19th century when the Industrial Revolution caused an increase in the size of buildings for industry, residential use, and services.
it united its territories under a central government
Atrium? (:
The Hypocaust is what the Romans called their method of making the walls and floors hot so that you would of had to wear sandals. Only few people got to go into that place because the rich people wouldn't go in so the slaves did it by making sure that the furnace's fire wouldn't go out.