Passive houses

What is the passive house of Namai A+ like?

A passive house is an energy efficient, comfortable, economical and eco-friendly house standard. Passive components (such as thermal windows and insulation materials) and heat recovery ensure active energy saving and heating of the house. From the outside, passive houses look just the same as regular homes. The expression "zero energy use house" or "passive house" describes the achieved performance rather than a construction method or architectural solution. Therefore, passive houses may be of any shape and size - these may include individual houses, apartment buildings or commercial properties.

Efficient for humans and nature

Passive houses constructed according to the technologies of the oldest European Pasivhaus Institut, Germany, uses not more than 15kWh of energy per 1 sq. meter of the residential area annually. This translates to the energy economy of 80-90% compared to energy consumption of a regular house. Any source of energy or heating equipment may be used: electricity, gas, firewood or wood pellets. Most important, the energy consumption of the house is minimum. Read more about house quality and technical characteristics.

Comfortable and healthy

A passive house has a stable indoor microclimate without draughts and temperature fluctuations as well as cold corners of the house. It automatically ensures excellent air quality with minimum technical means. Air tightness not only protects the house against cold in winter but also against heat in summer. The maximum noise level in the passive house is 25 dB(A), thus you will not be disturbed by outside noise. Filters purify the air of dust, pollen and other small particles, making it especially beneficial for people who suffer from allergies.


Investment specialists say that a private house is a liability that requires expenses but never generates income. The construction costs of the passive house are 10 to 25 or more percent higher, but its energy consumption is 80 to 90 percent lower. Therefore, compared to a regular house, a passive house, in a way, is an asset, additional investments in which pay off in 4 to 8 years. On top of it all, energy efficient houses retain their market value longer. In Lithuania, each passive house is certified thus you can rest assured that all designs of Namai A+ meet the highest quality and energy efficiency standards.

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„Namai A+“ quality standards

Namai A+ is the first and only (as of the end of 2011) certified company specializing in A++ grade passive house design in West Lithuania.

You may rest assured that your new house will be energy efficient - passive houses designed by our experts meet the requirements set by the international Passive House Institute, Germany. Each passive house constructed by us undergoes a testing procedure and the owners of the house receive energy efficiency certificates. A certified Namai A+ passive house ensures the following benefits:

High degree of cosiness and comfort

  • Windows and doors, high indoor temperatures and low heat loss through the building envelope allow you to do without heating in residential premises.
  • Ventilation equipment continuously ensures air purity without causing draughts.
  • The noise level emitted by ventilation equipment must not exceed 25 dBa
  • Energy efficient household appliances, lighting, hot water tanks and good thermal insulation help reduce overheating in summer and contribute to passive ventilation.

An exemplary standard of technological and structural quality

  • In order for the passive house to meet the standard, to minimize heating costs and to prevent moisture and condensate in structures, the amount of natural infiltration to the building is ensured. Verified by pressure test.
  • To ensure the supply of healthy and pure air, timely replacement of air filters and a device for condensate drainage is ensured.

Energy-efficient and warm house

  • The heat transfer coefficient of partitioning structures does not exceed 0.15 W/(m²K), and in individual residential houses, it usually amounts to a maximum of 0.10 W/(m²K).
  • The heat transfer coefficient of glass units does not exceed 0.80 W/(m²K) indoors.
  • The total heat transfer coefficient of window does not exceed 0.80 W/(m²K).
  • Heat loss is reduced by thermal insulation and well-insulated hot water piping systems.
  • The efficiency of ventilation equipment is at least 75%, and the consumed energy power should not exceed 0.45 Wh/m² of supplied air.

In order to ensure that not only the house design but also the completed house meets all quality and energy efficiency criteria, we perform a full technical control of construction and issue documents certifying this.

"A+" is the EU energy efficiency sign used to label products meeting the highest standards applied to the products of a certain category. Thanks to the passive house design programme, it has been proven that a passive house is a truly economical house:

  • Heat energy ≤ 15 kWh/(m²) or heat load ≤ 10 W/m²
  • Air exchange (natural infiltration) n50 ≤ 0,6 h-1
  • Primary energy 120 kWh/(m² per season)