The first impression given to those entering the frigidarium was that it was a cold space. This was amplified by the presence of ice-cold water and marble-covered pools that kept the temperature constant. Its size, the initial presence of marble cladding on the walls and a possible oculus-shaped opening in the centre of the dome did not allow the room to retain the heat coming from the subsequent warmer paths. What a chill the people must have felt when staying in the frigidarium, further amplified by the coexistence of different stone materials that nevertheless reflected its public use.
