Hello everyone,
maybe someone here can give us a good tip, as we are quite uncertain about a ventilation system.
We are planning to build a house (solid construction) according to KfW 70 standards, with underfloor heating, a fireplace, and a solar system. That much is already decided.
We received an offer from Company A for a ventilation system with heat recovery, and the salesperson recommended it to us.
At Company B, the ventilation system is significantly more expensive, and the salesperson told us that since the house is so well insulated, moisture would not be an issue... where would it come from? The rest could be regulated by normal airing anyway.
(I also think he realized that his ventilation system would have blown our budget and now I worry that he advised us against it just for that reason!)
My husband and I are laypersons, but my instinct tells me that the better the house is insulated, the more problems I would have getting rid of moisture and stale air inside the house, right?
After all, a blower door test does show that there is very little air circulation.
Am I completely wrong?
We are a bit torn now, since such a system is not exactly cheap! But is it necessary, or just a nice extra?
Thank you very much for your help!
maybe someone here can give us a good tip, as we are quite uncertain about a ventilation system.
We are planning to build a house (solid construction) according to KfW 70 standards, with underfloor heating, a fireplace, and a solar system. That much is already decided.
We received an offer from Company A for a ventilation system with heat recovery, and the salesperson recommended it to us.
At Company B, the ventilation system is significantly more expensive, and the salesperson told us that since the house is so well insulated, moisture would not be an issue... where would it come from? The rest could be regulated by normal airing anyway.
(I also think he realized that his ventilation system would have blown our budget and now I worry that he advised us against it just for that reason!)
My husband and I are laypersons, but my instinct tells me that the better the house is insulated, the more problems I would have getting rid of moisture and stale air inside the house, right?
After all, a blower door test does show that there is very little air circulation.
Am I completely wrong?
We are a bit torn now, since such a system is not exactly cheap! But is it necessary, or just a nice extra?
Thank you very much for your help!
D
DerBjoern28 Apr 2014 14:09cuhnie schrieb:
Despite all the enthusiasm, you should not overlook the disadvantages of a controlled residential ventilation system. These systems do not only offer benefits in terms of fresh air.The only disadvantage I know of is that a controlled residential ventilation system costs money...
B
Bauexperte30 Apr 2014 11:39Hello,
The following information is taken from an energy consultation, so it cannot be said again that I am speaking badly of this system. Similar statements are also made by consumer protection agencies.
**On average, we spend 21.6 hours per day 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, for example, only 15 m³/h in a 60 m² (645 sq ft) apartment. However, DIN 1946-6 “Ventilation of residential buildings...” requires a minimum value of 60 m³/h for this type of residential unit. Buildings sealed this way must then be supplied by the occupant either by window ventilation with a sufficient airflow or by a controlled mechanical ventilation system with heat recovery.
Advantages
Disadvantages
**Source: Engineering Office Schreiner
For me personally—and this is off-topic—a controlled mechanical ventilation system with heat recovery is a no-go simply because it restricts/encloses me in my own home. I am certainly not willing to spend thousands of euros for this effect.
Regards, Bauexperte
Mycraft schrieb:
I can only agree with that; with professional installation and correct sizing, I am not aware of any further disadvantages
The following information is taken from an energy consultation, so it cannot be said again that I am speaking badly of this system. Similar statements are also made by consumer protection agencies.
**On average, we spend 21.6 hours per day 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, for example, only 15 m³/h in a 60 m² (645 sq ft) apartment. However, DIN 1946-6 “Ventilation of residential buildings...” requires a minimum value of 60 m³/h for this type of residential unit. Buildings sealed this way must then be supplied by the occupant either by window ventilation with a sufficient airflow or by a controlled mechanical ventilation system with heat recovery.
Advantages
- Preservation of health and building structure
- Energy savings through controlled ventilation with heat recovery
- Automatic fresh air supply (no window ventilation)
- No drafts or noise from air movement
- Removal of pollutants (to some extent), stale air, and moisture
- Prevention of mold growth
- Noise protection
Disadvantages
- Not necessarily recommended for fresh air enthusiasts
- The low fresh air volumes usually do not meet hygiene requirements
- The building must be constructed as airtight as possible
- For air circulation, door gaps are necessary
- Transmission of airborne noise (through door gaps)
- Retrofit in older buildings is relatively complex
- Additional costs for system technology
**Source: Engineering Office Schreiner
For me personally—and this is off-topic—a controlled mechanical ventilation system with heat recovery is a no-go simply because it restricts/encloses me in my own home. I am certainly not willing to spend thousands of euros for this effect.
Regards, Bauexperte
D
DerBjoern30 Apr 2014 11:51Bauexperte schrieb:
- Not necessarily recommended for fresh air enthusiasts
For fresh air enthusiasts, these systems are actually great!
- The low fresh air volumes usually do not meet hygiene requirements
Where does that claim come from?
The building must be constructed as airtight as possible That’s basically the goal nowadays anyway.
- Door gaps are necessary for air circulation
That is a possible solution for most systems, yes.
- Retrofit in older buildings is relatively complex
- Additional costs for the system technology
As mentioned before, a controlled ventilation system simply costs more money, yes…
Personally — and off topic — a controlled ventilation system with heat recovery is a no-go for me just because it restricts/confines me in my own home. I would never spend thousands of euros for that effect. I don’t see how our controlled ventilation system restricts or confines me at all!
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