Passive houses

The first passive houses were built in 1990, in Germany, and the german example were followed by the Scandinavian countries and Switzerland. From then and, of course, because of the conservation of the limited resources of fossil fuels (petroleum, natural gas, etc.) and to protect the environment, the numbers of the passive houses are continuously increasing, not only in Europe, but in USA as well.

Passive houses:

 the key concepts for passive houses are: energy efficiency, cozy, sustainable, innovative.

Passive houses

 means more thermal efficiency and minimum energy consumption. The passive energy sources include high efficiency insulation, the heat recovery systems (ventilation), the sun (solar). Although not every house which meets some of these criteria can be called passive house.

Passive houses:

 to obtain this title it requires fulfilling a few calculations regarding the energy consumption of the house. According to these criteria the heating energy should not be more than 15kW/m2 per year.

The benefits of a passive house:
- Low heating and cooling costs. According to the criteria for a passive house, you can save more than 90% energy for heating / cooling 
- High thermal comfort and always fresh air. The temperature of the house is constant and uniform, there is no heat fluctuation and the air is refreshed time to time, filtered from dust and other allergens, which has a positive impact on the health of the inhabitants

Regarding of the building costs, for a common house must add a superior thermal insulation, special carpentry and heat recovery ventilation system.
Passive houses
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