The tepidarium was the warm (tepidus) bathroom of the Roman baths heated by a hypocaust or underfloor heating system.The specialty of a tepidarium's the pleasant feeling of constant radiant heat which directly affects the human body from the walls and floor. There's an interesting example at Pompeii; this was covered with a semicircular barrel vault, decorated with reliefs in stucco, and round the room a series of square recesses or niches divided from one another by Telamones. The tepidarium i… (More on Tepidarium)