I think the most interesting thing about Passivhaus is that it is defined by the allowable heat loss (or gain) per square meter:
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The building must not use more than 15 kWh/mē per year.
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This means that for each region, the R-value required will be different, so a Passivhaus in N. California may require R-30 (a guess), but one in N. Dakota may require R-80 (again, a guess).
Regards,
-AC_Hacker