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Regarding my question i read this: Object: Site:GroundTemperature:BuildingSurface "Otherwise, take the indoor air temperature and subtract 2C as a reasonable starting value to use for most commercial applications in the U.S."

So should I simulate (in my example a 1 zone house) without HVAC (the house is located in europa/germany) - take the averrage monthly room temperature and substract 2C - and this are the values for Site:GroundTemperature:BuildingSurface?

And if there is a HVAC system - same approach (modeling without HVAC, set ground temperature)?

Thank you very much.