Table of contents:

Decentralized living space ventilation: you should know that
Decentralized living space ventilation: you should know that

Video: Decentralized living space ventilation: you should know that

Отличия серверных жестких дисков от десктопных
Video: Vitovent 100-D - decentralised domestic ventilation unit with heat recovery | Viessmann (ENG) 2023, February
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With decentralized living space ventilation you supply fresh air to individual rooms and save heating costs by means of heat recovery. We explain the functionality and advantages, as well as the costs of this ventilation system.

Table of contents Table of contents decentralized ventilation: functionality and costs

  • variants
  • benefits
  • costs

Table of contents Table of contents decentralized ventilation: functionality and costs

  • variants
  • benefits
  • costs

In contrast to the central ventilation system with an air distribution system in the basement or technical room, the decentralized living room ventilation is located in individual rooms: It only supplies individual rooms that are difficult or impossible to ventilate manually (e.g. kitchen or bathroom), specifically with fresh air. Since the installation of this ventilation system is relatively low, it is used in particular in the renovation of old buildings. The ventilation system is usually installed in the outside wall of the house. In the following we will explain three variants of decentralized ventilation systems.

Reading tip: Anyone who wants to get an idea of ​​the advantages, functionality and costs of ventilation systems in general can find helpful information in our guide.

The variants of decentralized ventilation systems in comparison

1. Exhaust system

A normal exhaust air system transports the used air outside and is primarily used in the kitchen and bathroom. How it works: As soon as the light is switched on, the exhaust fan usually starts, which directs the used room air to the outside via a pipe. In the course of this, a negative pressure forms and fresh air flows in from the inside of the house. Although this system is relatively inexpensive, valuable heat is also lost due to its mode of operation.

2. Decentralized supply and exhaust air system

A decentralized supply and exhaust air system has the advantage over the conventional exhaust air system that it supports a stronger air exchange: At the same time, this ventilation system draws in fresh air from outside and discharges the used air. Your controller works with moisture and CO2 sensors. Filters against dust and pollen can also be implemented - especially recommended for allergy sufferers! The disadvantage of a decentralized supply and exhaust air system is also the same here as for a simple exhaust air system: heat loss.

3. Decentralized living space ventilation with heat recovery

Decentralized living space ventilation with heat recovery is also located in the outer wall of a house, but has the advantage over the previous variants that it has a metal or ceramic heat exchanger. This extracts valuable heat from the used room air that flows outside and passes it on to the fresh air that flows in. This conserves approximately 80 percent of the heat that would normally have been given away. The result: significantly higher energy efficiency!

Renovierung: Altbau
Renovierung: Altbau

Decentralized living space ventilation is particularly suitable for the modernization of old buildings because their installation effort is very low.

Photo: iStock / hanohiki

Advantages of decentralized living space ventilation

  • Simple, quick installation and little planning effort: While the installation of central systems involves a lot of effort, with decentralized ventilation systems you “only” need a wall opening and a power connection. Retrofitting is also possible. Another advantage: You are not forced to install an air distribution system. Instead, the systems are installed in the outer wall via a core hole - ideal for the modernization of old buildings!
  • Costs: In total, the purchase of decentralized living space ventilation is cheaper than a central ventilation system with an air distribution system. It is also crucial that decentralized ventilation systems with heat recovery save heating costs and work in an environmentally friendly manner.
  • Easy handling: Decentralized ventilation units can be cleaned quite simply. The filter replacement can also be carried out smoothly.
  • Individual room ventilation - flexible decision: You can easily decide which rooms should be equipped with a decentralized ventilation unit. If you don't have a window in the bathroom, for example, you can still achieve a good indoor climate with a decentralized ventilation system: despite the high humidity, the used air can escape and mold can be avoided.
  • Protection against moisture or mold: Due to the constant air exchange of used and fresh air, users of decentralized ventilation do not have to worry about damp walls in the house.

Cost of a decentralized ventilation system

The amount of the costs depends in particular on the area and nature of your house. If you want to buy a decentralized exhaust air system, you can calculate roughly with costs between around 1, 500 and 2, 500 euros. In comparison, the costs for the purchase of a decentralized supply and exhaust air system with a heat exchanger start at around 4, 000 euros.

The Kreditanstalt für Wiederaufbau (KfW) supports you in the purchase of decentralized ventilation through loans or grants. Please note that you should request the subsidies together with an energy consultant before installation. Further prerequisites for the funding programs and important detailed information can be found on the KfW website.

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