The general principle of the Passive House is energy efficiency. Excellent thermal protection, innovative window technology, an airtight construction, highly efficient building services for ventilation, heating and hot water as well as electricity-saving household appliances are essential for achieving this principle. The Passive House technology not only reduces energy consumption but also increases thermal comfort and improves the building‘s protection.
The improved thermal insulation in Passive Houses reduces heat losses and leads to higher indoor surface temperatures
in the winter and to lower temperatures in the summer. They hardly differ from the ambient temperature, providing for a
pleasantly warm, uniform indoor climate without any cold corners or risk of condensation. All constructions – whether
solid, timber, steel or mixed – can be implemented with highly insulated building envelopes.
In Passive Houses during the summer, high temperatures can be prevented to a great extent. The good insulation protects
not only against the cold but against heat as well, provided that not too much heat is already present indoors. During the
winter months, the sun’s free warmth is of course desirable. Windows that face south are ideal, because during the winter,
the sun is low in the sky and can shine directly into the house.
In summer, the sun is high in the sky and fewer of its rays can enter southern windows. Effective shading must be provided in particular for windows that face west and east. The house can also be ventilated through the windows in the hot months. A calculation sheet for planning good summer temperature values is available in the Passive House Planning Package. The tool can be used to estimate summer temperatures and plan suitable protective measures against summer heat.