Hello everyone,
We are currently starting to deal with the technical aspects of our single-family home.
I haven’t found a thread discussing whether a ventilation system generally makes sense or not. So here is a general discussion thread on the topic:
At first, we looked into various timber frame construction providers, which made us quite sensitive in this area. Naturally, a ventilation system is quite important due to the tighter building envelope, which I can completely understand. However, everything is also marketed accordingly...
Since we have now decided to go with a regional solid construction company, completely different questions arise:
I currently have a detailed offer from a solid construction company:
- $10,000 additional cost for thermal insulation measures
- $13,000 additional cost for a central ventilation system or $9,000 additional cost for a decentralized ventilation system
--> So the repayment subsidy of $18,000 is of little use to me; on the contrary, I am even paying extra for this (of course, I get a “better” house in return).
Key Data:
- Single-family home city villa, 150m² (1,615 ft²) with basement
- Air-to-water heat pump
- Building material: brick
The questions I am now asking myself:
1. Is a ventilation system even necessary to achieve KfW 55 standard?
2. If yes, would it maybe make more sense to go for KfW 70 and forget about the subsidy?
3. Is a ventilation system really that great? There are many reports about noise, high maintenance, etc.
4. If yes, in our building project would a decentralized or central system be better? I have read a lot of positive things about decentralized systems, so central ones might not be an option? Is that correct or not?
5. Is it even possible to reach KfW 55 standard otherwise? Do you really have to ventilate every 2 hours? Are there any experiences?
6. Is the additional $10,000 cost for KfW 55 without a ventilation system justified? Are the prices for the ventilation systems justified?
I know this is an endless debate and there are clearly two opinions here. However, we find it really difficult to make a decision. Maybe a few discussions and information here will help us make up our minds.
We are currently starting to deal with the technical aspects of our single-family home.
I haven’t found a thread discussing whether a ventilation system generally makes sense or not. So here is a general discussion thread on the topic:
At first, we looked into various timber frame construction providers, which made us quite sensitive in this area. Naturally, a ventilation system is quite important due to the tighter building envelope, which I can completely understand. However, everything is also marketed accordingly...
Since we have now decided to go with a regional solid construction company, completely different questions arise:
I currently have a detailed offer from a solid construction company:
- $10,000 additional cost for thermal insulation measures
- $13,000 additional cost for a central ventilation system or $9,000 additional cost for a decentralized ventilation system
--> So the repayment subsidy of $18,000 is of little use to me; on the contrary, I am even paying extra for this (of course, I get a “better” house in return).
Key Data:
- Single-family home city villa, 150m² (1,615 ft²) with basement
- Air-to-water heat pump
- Building material: brick
The questions I am now asking myself:
1. Is a ventilation system even necessary to achieve KfW 55 standard?
2. If yes, would it maybe make more sense to go for KfW 70 and forget about the subsidy?
3. Is a ventilation system really that great? There are many reports about noise, high maintenance, etc.
4. If yes, in our building project would a decentralized or central system be better? I have read a lot of positive things about decentralized systems, so central ones might not be an option? Is that correct or not?
5. Is it even possible to reach KfW 55 standard otherwise? Do you really have to ventilate every 2 hours? Are there any experiences?
6. Is the additional $10,000 cost for KfW 55 without a ventilation system justified? Are the prices for the ventilation systems justified?
I know this is an endless debate and there are clearly two opinions here. However, we find it really difficult to make a decision. Maybe a few discussions and information here will help us make up our minds.
S
Strahleman26 Jun 2020 19:30Abzug86 schrieb:
Can anyone definitively say if there is a Helios ventilation system that is eligible for funding in combination with an Alpha Innotec LWDV? Then I could simply ask for that specific unit.... Take a look at the Maico funding info (just search for Maico BAFA). It states, among other things:
One of the following requirements must be fulfilled to apply for government funding:
Direct connection between the controlled residential ventilation unit and the heat pump with a common controller (analog or digital) via cable or wirelessly via WiFi, Bluetooth, radio, etc.
This means it is independent of the ventilation system brand, since any controlled residential ventilation can be made "smart." To be completely sure, of course, you should have the planned combination including the control method confirmed in writing by BAFA.
A silly question about that. What exactly can be controlled "smartly" in the mechanical ventilation system with heat recovery when combined with the heat pump?
Which parameters X of the mechanical ventilation system would you want to adjust when the heat pump is in state Y?
Which parameters X of the mechanical ventilation system would you want to adjust when the heat pump is in state Y?
OWLer schrieb:
What exactly is there to control "smartly"? I can’t really think of a practical use case for that. Maybe you want to prevent the controlled residential ventilation system from switching to bypass mode while the heat pump is running in heating mode. Usually, a temperature sensor with a setpoint handles this in controlled ventilation systems anyway, so that should be sufficient.
It seems more like a smart home or digitalization feature.
It depends on which priority is most important. This could be air quality levels, efficiency, energy-saving modes, frost protection, and so on.
Depending on the requirements and the extent to which the systems are integrated, various possibilities arise.
Two systems running side by side are not always the best solution.
Depending on the requirements and the extent to which the systems are integrated, various possibilities arise.
Two systems running side by side are not always the best solution.
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