By use of thermal insulating materials in conjunction with the other key criteria of Passive House, the heating/cooling demands of the building can be reduced by up to 90% of a conventionally constructed building. Keeping constant internal temperatures prevents mould and condensation, creating a hygienic internal environment.

Airtightness is another crucial component for a Passive House. Airtightness allows a complete control of the internal air quality and temperature by not allowing any drafts in or air out. Through meticulous construction methods and careful supervision, it has been shown that airtightness can be successfully achieved.

As the building is airtight, mechanical ventilation is imperative to control the airflow inside the building. By use of filters and heat recovery, the outdoor air is cleaned and cooled or heated prior to being supplied into the home. Heat from inside is used to heat the incoming cooler air in winter, saving energy and providing clean, pollutant free air. As such, Passive House internal air is always clean and temperate, 24/7.

As windows make up part of the thermal layer, window performance is paramount for effective performance. High performance windows aligned with the thermal layer, positioned in the correct orientation allow for renewable solar heat to enter the building without compromising the internal environment.

Since the energy demand of a passive house is so low (90% less than conventional construction), the energy demand can be very easily met through renewable energy sources. namely in some Australian capital cities which see lots of sun throughout the year, solar energy can be effectively and reliably used to provide energy. That being said, electrical appliances can be also be used effectively as the energy use if so astoundingly low.