Although central heating is considered to be a modern day thing, it dates back to ancient Greece. The definition of central heating is a system that provides warmth to either the whole of the inside (or just a segment) of a house/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 AC (air conditioning) unit, air filter and a humidifier. The pipes themselves will normally be made from metal wrapped in insulating foam to keep in as much heat as possible.

Central heating is different to local heating because the generation of heat happens in one place, such as a furnace room. The most commonly found way of generating heat involves combusting fossil fuels in a furnace or boiler. The heat then gets circulated, usually by air that is being forced through pipe work, by steam thats being pushed through piping or by water thats 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 powered by gas, oil, or coal can are used in parts of the US, Europe and Russia, more so in bigger buildings. Systems of electrical heating are less commonly found and are only used in areas of cheap electricity.

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