Internal manipulation of Weather data

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Hi All,

I have observed 3% difference in the energy consumption for a given
location while specifying two different years (2010 and 2011). How does
eQUEST (or any energy simulation s/w) internally extrapolates the weather
data based on the specified year?

I feel 3% difference in energy is very significant. Any guidelines on
selection of TMY (typical meteorological year) ?

Thanks in advance!

Regards,
Siddharth Venkataraman

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