Heating and ventilation

Low-energy houses annually consume between 15 kWh/m2a and 30 kWh/m2a of energy for heating.

Heating/cooling the house, or in other words “comfortable living”, is the main reason why the majority of energy is consumed. Energy is consumed for establishing a pleasant climate in the room bordered by surroundings with a generally less favourable climate. A house is not an adiabatic system in which it is possible to set up the desired temperature once and it would remain the same forever. Besides losses through the external envelope, losses also occur due to ventilation and other activities of the residents.


Besides the low costs of heating, the most important elements in low-energy houses are effective heating, ventilation and the preparation of domestic water. Improving thermal protection also reduces specific thermal losses. Low levels of thermal loss require low-temperature heating systems and the use of renewable resources. The majority of low-temperature houses are therefore heated with flat-surface heating (floor, wall or ceiling).

But an increasing number of low-energy and passive houses have compact devices that combine all the required components for heating/cooling, ventilation and the preparation of domestic water. They operate on the principle of connecting all the components and thus achieving the maximum utilisation rate. Its concept is different to other heating systems. The compact device removes heat from the waste air via the air-air heat pump system and heats the incoming air for ventilation (in the summer, the system works in reverse and provides cooling).

Should a Passive House be Heated or Not?

A passive house requires almost no heating, because the majority of the required heat is obtained in an indirect (passive) way. But due to the very high standards of comfort, some heating is nevertheless required. At Rihter, we will advise you on choosing a suitable system and ensure that the construction costs are not unnecessarily increased.