Although it is considered a modern convenience, central heating goes right back to Ancient Greece. Central heating itself is a system that provides heat to either a section of, or the whole of the interior of a given building.

Central heating is believed to have been invented around the 350 BC mark to warm the Great Temples and the homes of the wealthy. Their systems worked by circulating warm air through flue systems in the floor. In todays systems, we can power blowers with electricity, therefore billions of homes around the world are heated by forced air systems.

A forced-air heating system pulls the air in a room through piping to a flame/furnace, where the air is warmed up and filtered. This heated breeze is then pushed back into the house via more piping. A lot of manufacturers will make multiple different sizes in each model. These systems come in different models, like "downflow," "upflow" and "horizontal" versions designed to accommodate a range of space limitations.

These systems are sometimes used with an air filter, an AC (air conditioning) unit, and a humidifier. The pipes in the system are usually made from a hard-warring metal like copper surrounded in insulation for optimum heating.

Local heating differs from central heating as the heat is generated in one place, e.g. a furnace room. The heat then begins circulating, usually either by water thats being forced through piping, steam thats being pushed through pipe work or by air that is being forced through piping.

In many parts of northern Europe, where most people do not need air conditioning in their homes because of the fairly cold weather they have there anyway. Most new houses come with installed central heating. Areas like this will usually use district heating, oil-fired systems or gas heaters.

Steam heating systems, heated by oil, coal or gas can be found in the USA, Russia and Europe, usually in the bigger buildings. Electric systems are found less and are practical only with cheap electricity or where geothermal heating pumps are used.

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