Do you have a well insulated home which should neither heat up in summer nor cool down in winter? Should the interior benefit continuously from hygienic, healthy air? In that case you should ensure optimum ventilation at all times.
Poor air quality can create an unpleasant atmosphere and have a negative effect on health. Furthermore, poorly ventilated interiors suffer from retained humidity which encourages the growth of mould. Ventilating regularly is therefore highly important, preferably several times a day. Who provides ventilation when no one is at home? The answer is simple: a ventilation system, of course. It filters out pollen and fine dust from the air and ensures excellent air quality. In addition, it prevents excess humidity. Ventilation with heat recovery also almost completely stops heat being lost through ventilation, protecting both the environment and your wallet.
In general, there are two kinds of ventilation systems: central and decentralised. Central ventilation systems ensure that fresh air is supplied to the entire building. Decentralised ventilation units are only installed as required in rooms that have a particular need for them. The general principle behind both versions is the same: air is mechanically drawn into and out of the building.
Central systems are more complex than decentralised versions as they supply several rooms with air. At the centre of a ventilation system, there are always two fans. Supply air vents and extract air vents are installed in different rooms. Air flows from outdoors via an air distribution system into the "supply air rooms" (living room, bedroom, children's room, etc.). Stale and humid air is drawn from "extract air rooms" (such as the kitchen, bathroom and WC) and is transported to the outside. The resulting negative pressure draws fresh air to these areas from the supply air rooms, ensuring that the entire house receives an even supply of healthy air.
For this, the fans operate highly efficiently in terms of energy consumption, utilising sensors that recognise the state of the air in the interior and only extracting stale air when necessary. Naturally, a manual override is also possible.
Advanced ventilation systems operate with heat recovery. They utilise the heat/cooling energy in stale air to heat up the incoming outdoor air in winter or to cool it in summer. Integral filters clean the air of pollen and fine dust.
Decentralised mechanical ventilation systems also regulate the supply and extract air mechanically using fans. Complex air ducts are not required as such systems are only installed in individual rooms.
The entire building is ventilated automatically, stale air is routed to the outdoors and fresh air is simultaneously drawn into the interior. In addition, filters free the supply air of pollen and fine dust. Heat recovery ensures that the heat in the extract air is used to preheat the incoming outdoor air. This takes the strain off your heating system, and you save energy and money.
Central mechanical ventilation systems are somewhat more expensive than decentralised ones in terms of initial purchase costs. On the other hand they offer a higher level of convenience. In addition to the costs for the system itself, there are further expenditures, such as the power supply, redecorating costs and possibly minor repairs. In daily use, mechanical ventilation units result in a slightly higher power consumption. However, heating costs can be reduced through heat recovery.
The installation of a ventilation system is subsidised by the Kreditanstalt für Wiederaufbau (KfW) [Germany]. However, such subsidies must be applied for prior to the installation in conjunction with an energy consultant.
The installation of a central mechanical ventilation system is relatively complex and occurs most frequently in new buildings. It must be planned accurately in order to ensure trouble-free and hygienic operation later on. It is also particularly important that the entire system can be serviced easily and quickly. Decentralised ventilation systems can be retrofitted without major building work. This makes them suitable for older buildings that have been renovated.
In order to ensure the smooth functioning of the system, filters must be replaced regularly. You can easily do this yourself or it can be part of a maintenance contract with a professional.
The quickest way to find out which mechanical ventilation system would be suitable for your home is to arrange a meeting with a specialist.