Central Heating

The ancient Romans (the wealthy ones) had central heating in their homes. They used a system called 'hypocaust' that produced and circulated hot air below the floor of a room, and also warmed the walls with a series of pipes through which the hot air passed. The earliest example of such a system was the temple of Ephesus that was built in 350 B.C. Excavations at Mohenjo-Daro in what is now Pakistan have unearthed what is believed to be a hypocaust lined with bitumen-coated bricks. If it fulfilled a similar role, the structure would pre-date the earliest Roman hypocaust by as much as 2000 years.