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Passive solar heating is the absorption of solar energy in a building to reduce the energy required to warm the habitable areas (i.e. to contribute to space heating).

Air is normally used to circulate and distribute the collected energy, generally without the use of pumps or fans. The collector may be an integral part of the building, perhaps designed as part of an architectural feature that provides light and heat.

Indeed, the air flow generated can be used as a means of ventilating the building, or even cooling it by drawing in cooler air to replace upwardly moving solar heated air.

 

 

 

 

 

 

 

 

Source: http://www.solarbuzz.com/Consumer/Solarthermal.htm