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A ventilation system increases the living comfort in your house or apartment. It improves the indoor climate, regulates humidity, reduces the risk of mold and protects your family from dangerous particulate matter, hay fever or pollen particles. In addition, when properly sized, it reduces energy consumption for heating. Ideally, for every cubic meter of air supplied to the room (supply air), one cubic meter of air should be exhausted (exhaust air). The Swiss Federal Office of Energy SFOE recommends 30 cubic meters of supply air per hour for the living room, bedroom and study, and the Swiss Society of Engineers and Architects (SIA) recommends at least 20 cubic meters of exhaust air per hour for the kitchen or bathroom with shower and 20 cubic meters for the toilet without shower. If the ventilation is undersized, the air exchange will not meet these recommendations, if it is oversized, you will pay energy costs for an unnecessary extra output. Basically, you have a choice between two systems: Central ventilation and decentralized ventilation. We compare the systems and share the approximate cost of a ventilation system.
A central ventilation system is networked throughout the house and directs fresh air into all rooms. Because there is only one control, you can only regulate the ventilation for the whole building, but not adjust it individually for each room. Air ducts are installed under the floor or in the ceiling. It is easier in the shell, that is why a central ventilation system is suitable mainly for new buildings. However, it could be installed in an older house with extra effort.
The individual rooms are ventilated individually, the ventilation is controlled by a zone regulation for each room. For smaller rooms, one ventilation unit is sufficient for the supply and exhaust air, for larger rooms you need two units - one draws in fresh air, one removes stale air. For the bathroom or WC, a simple exhaust air system is usually sufficient. Because decentralized ventilation does not require an air distribution system and therefore takes up less space, it is well suited for renovations.
These are the biggest differences between the two ventilation systems: A ...
The decision depends on several factors that may influence each other. It is best to ask a ventilation expert for advice and to explain the advantages or disadvantages of the systems.
For a single-family home with 150 square meters of living space, calculate 16,000 to 20,000 Swiss francs for the materials, labor and all electrical connections. For energy consumption, you should expect about 500 kilowatt hours per year. At 27 centimes per kilowatt hour, that makes 135 Swiss francs in energy costs per year. This is more than for a comparable decentralized ventilation, but a central ventilation moves more air. That is why the price-performance ratio is better in the long term. In addition, there are the maintenance costs, because the system should be cleaned regularly for reasons of hygiene.
A simple exhaust air system for the bathroom or WC costs from 4,000 Swiss francs. For a decentralized ventilation system for a single-family home of about 150 square meters, you should expect to pay about 12,000 Swiss francs without heat recovery or 15,000 Swiss francs with heat recovery. If you only ventilate individual rooms decentrally, you should expect to pay about 2,000 or 2,500 Swiss francs per room. With heat recovery, you save on heating costs because the energy from the exhaust air heats the fresh air. For energy consumption, you should calculate with plus/minus 15 Swiss francs per room per year.
In Switzerland, there are two programs that provide financial support for a ventilation system under certain conditions: