KfW 70 without ventilation system

Despite all the enthusiasm, you should not overlook the disadvantages of a controlled residential ventilation system. The systems not only offer advantages in the form of fresh air.

It is the same with everything, however. Heating systems, floor coverings, fuel for vehicles, etc. The pros & cons of ventilation systems have already been discussed enough here. The decision must be made by each individual for themselves.

Despite all the enthusiasm, you should not overlook the disadvantages of a controlled residential ventilation system. The systems do not only offer advantages in the form of fresh air.

The only disadvantage I know is that a controlled residential ventilation system costs money...

I can only agree with that; with professional installation and correct sizing, I am not aware of any further disadvantages.

Hello,

I can only agree with that, with professional installation and correct dimensioning I am not aware of any further disadvantages

I have taken the following from an energy consultation, so it won’t be said again that I speak badly of this system. Comparable statements are also made by consumer advice centers

**On average, we spend 21.6 hours daily indoors and breathe 18,000 liters of air. In well-insulated and airtight residential buildings (renovated buildings, low-energy houses, etc.), a minimum air exchange rate of 0.1 1/h can occur. This corresponds to an air exchange rate of only 15 m³/h in a 60 m² apartment, for example. However, DIN 1946-6 "Ventilation of apartments..." requires a minimum value of 60 m³/h for this apartment group. Buildings sealed in this way can only be supplied by the user through window ventilation with a sufficient air rate ... or with a controlled residential ventilation system with heat recovery.

Advantages

[*]Preservation of health and building fabric
[*]Energy savings through controlled ventilation with heat recovery
[*]Automatic fresh air supply (no window ventilation)
[*]No drafts or noises on the air side
[*]Removal of pollutants (partially), used air and moisture
[*]Prevention of mold growth
[*]Noise protection

Disadvantages

[*]Not necessarily recommended for fresh air fans
[*]The small fresh air volumes generally do not meet hygiene requirements
[*]Building must be built as airtight as possible
[*]Door gaps are necessary for air circulation
[*]Airborne sound transmission (door gaps)
[*]Retrofit in old buildings relatively complex
[*]Additional costs for the system technology

**Source: Engineering office Schreiner

For me personally – and therefore OT – a controlled residential ventilation system with heat recovery is a no-go simply because it restricts/confines me in my own house. I definitely will not spend thousands of euros for this effect.

Rhineland regards

[*]Not necessarily recommended for fresh air fans

Especially for fresh air fans, these things are great!!

[*]The low amounts of fresh air usually do not meet hygiene requirements

Where does this claim come from?

Buildings must be built as airtight as possible

That's the goal nowadays anyway..

[*]Door gaps are necessary for the air connection

That is indeed a possible solution for most systems.

[*]Retrofitting in old buildings is relatively complex [*]Additional costs for the system technology

As already mentioned, a controlled residential ventilation simply costs more money, yes...

For me personally – and therefore off-topic – a controlled residential ventilation with heat recovery is a no-go just because it restricts/confines me in my own house. I would certainly not spend thousands of euros for this effect.

I wouldn’t know where our controlled residential ventilation restricts or even confines me?!