what is solar energy used for
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1)produce electrical energy (via photovoltaic cells)
2) heat water
It can be used indirectly:
1)To provide indoor lighting
2)To provide heating and cooling via a ground source heat pump. This is called Ground Source Geothermal, or low temperature earth energy or earth energy exchange or ground source energy exchange.
Solar energy is stored in the first few hundred feet of the earths surface. A heat pump uses conventional refrigeration technology to upgrade this heat typically around 50 or 60 degrees F to over 90 degrees and it does this at high efficiencies typically over 400%.
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http://www.climatemaster.com/
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M$Source: http://www.heating-and-air-conditioning-guide.com/home-heating-alternatives.html
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