The international Passive House Standard is achieved through a good level of thermal insulation, climatically optimized Passive House windows,
an airtight building envelope, an appropriate ventilation system, and thermal bridge free design.
In mixed climates,
building envelopes are constructed in an
airtight manner to control air leakage openings, to expedite air pressure control (depressurization of the
building envelope above grade during the heating season, pressurization below grade to control ingress of soil gas and other pollutants, and pressurization of the
building envelope during the cooling season) and to facilitate the dehumidification of indoor air during the cooling season, thereby limiting interior moisture levels.