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The Roman heating system was called a hypocaust. How did Romans heat their homes?Rich Romans liked to be warm and cosy. They had central heating at home, in villas and in public baths. The heating system was kept going by slaves, who kept a fire blazing in a furnace to heat warm air. The warm air moved around the building through spaces under the floors and between the walls.
They used an underfloor heating system called a hypocaust. The floor of the baths was raised by pillars. Hot air from the furnaces would travel through this space under the pools on its way to the roof through space left in the walls. This way the pools would heat up without bringing the water in contact with the smoke from the furnace. More good information here: http://en.wikipedia.org/wiki/Hyp...