Photovoltaic System - Natural Gas Connection?

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Dear All,

I have modelled a PV system in eQuest. Running the same model with and
without the PV system, I get a difference of 164 therm for space
heating. PV system decreases the gas consumption for space heating. The
mounting type is "rack" which means that there is no building shade
involved. I am at a loss on what this could happen. Any suggestions?

Thanks a lot,

Omer Moltay, LEED AP

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