+A hypocaust was an ancient [Ancient Rome](/wiki/ancient-rome) heating system, warming spaces from beneath. Hot air from a furnace flowed through cavities under floors and behind walls, providing early [Underfloor Heating](/wiki/underfloor-heating) for comfort and baths.
+## See also
+- [Roman Baths](/wiki/roman-baths)
+- [Thermal Mass](/wiki/thermal-mass)
+- [Heating](/wiki/heating)