Passive House project

Passive House project

Those who choose building a passive house make their first step by the road to independence and freedom, for a passive house is able to conserve thermal energy within the building with maximum efficiency. Such a house requires no energy-intensive heating systems, which brings to the customer independence from gas and other energy sources in future.

Longing for independence often contradicts to comfort, but not in a passive house! To be independent while enjoying warmth in a pleasant indoor microclimate – this is the dream that a passive house makes true.

Passive house – the way to 100% independence.

A passive house creates thermal comfort solely by reheating or recooling of the fresh air required for due air exchange. It is assumed that the house warms or cools itself only with warm (in winter) or cold (in summer) air inside, i.e. "passively". Therefrom "passive house" term emerges.

Provided that, conventional heat distribution system can be spared at all, primarily due to heat loss reduction by 80-90% with an optimised airtight envelope. In addition, triple-pane glasses with excellent heat transfer ratio reduce heat loss even further, while collecting solar energy indoors thanks to high energy transmission ratio. The windows let sufficient solar energy into the house even in winter and comprise an additional heat source in the total balance of the building.

In short, a passive house is a place which is warm in winter and cool in summer with NO air conditioning or conventional heating radiators!

A passive house can be Classic, Plus, or Premium according to the project or available funds

All passive houses all over the world are subject to universal boundary conditions:

  • Heating energy requirements ≥15 kW*h/m² year (ref. living area) – or heat load ≤10 W/m²;
  • Primary energy consumption ≤120 kW*h/m² year;
  • Airtightness min. n50 = 0.6/h;
  • Overheating rate in summer – less than 10%.

The above performance is ensured primarily by the following major  passive house criteria:

  • Heat insulated building envelope with heat conductivity coefficient U<0.15 W/m²
  • Ultimate heat bridge prevention
  • Passive use of solar energy
  • Building envelope airtightness n50<0.6/h;
  • Ventilation with hear recovery rate min. 75%
  • Highly efficient power saving home appliances
  • Water heating and reheating by renewable energy sources

10 basic rules for a passive house


Compact shape


Southernmost orientation


Multiple glass surfaces at the southern facade (argon-filled triple-pane glass)


Excellent airtightness of envelope


Good thermal insulation (25-30 cm)


Ventilation system


Use of renewable power sources


Ultimate heat bridge prevention


Summer sunshading, heat collector


Home appliances of energy efficiency class A or above