There are already single-family houses, the so-called. zero-energy in relation to the energy demand in general (for heating, powering devices, lighting, cooking). They do not require any external energy supply and ensure the maintenance of adequate thermal comfort.

They affect the reduction of energy consumption in the building:

• good thermal properties of building partitions:
– heat transfer coefficient U0 of external building partitions < 0,2 W/(m2K), the north wall is insulated 24 centimeter layer of recycled cellulose,
-heat transfer coefficient for windows U0 = 0,6 W/(m2K),
• optimized mechanical ventilation system with heat recovery and pre-heating of fresh air in the ground,
• passive solar energy harvesting system. Basic elements of integrated building heating systems (feature of modern solutions) are following:
• photovoltaic cells with a surface area 36 m2 with short-term battery 20 kWh,
• liquid collectors of solar radiation with a surface area 14 m2 (special construction with transparent insulation) for the production of domestic hot water,
• a water electrolyser using electricity from photovoltaic cells, whose task is to produce hydrogen and oxygen in the summer, that is, when there is an excess of electricity produced by photovoltaic cells in relation to the needs. The hydrogen and oxygen are then stored seasonally,
• hydrogen storage,
• fuel cell (with power 1 kW and total efficiency 80%), in which hydrogen is catalytically burned to produce electricity and heat for space heating.