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Efficient buildings can be characterized by high levels of comfort with very low energy consumption. This is achieved primarily by focusing on these five key principles: thermal insulation, windows, ventilation, thermal bridging, and airtightness.

Thermal Insulation

A well-insulated building keeps warmth in during winter and heat out during summer

Thermal Bridging

Especially in temperate and cold climates, efficient buildings are planned without thermal bridges. This ensures even lower heating costs and prevents building damage.


In temperate and cold climates, triple-glazing, insulated window frames, and proper placement ensure heat gains in winter. In warmer climates, double glazing is usually sufficient.


An efficient building has a continuous airtight outer shell. This protects the building structure, prevents energy losses and improves comfort.


Efficient buildings are supplied with consistent fresh air via the ventilation system. The heat exchanger ensures that air is supplied to rooms at nearly the room temperature without the need for additional heating – cold and heat remain outside.

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