A Hypocaust was a form of Roman central heating. A floor would sit on top of the tiles. Hot air from a burning furnace outside would be funnelled under the floor and through specially built vents in the wall.
Rich Roman families would have Hypocausts in their homes. What other rooms would be heated this way in their villa?
A hypocaust is the same technology that heated the public baths in Roman Canterbury. See what else you can learn about the Roman baths, who went there? What did they do there?