exto1791
2020-05-19 13:29:21
- #1
Hello everyone,
we are currently dealing with the technical aspects of our single-family house.
I haven’t found a thread discussing whether a ventilation system generally makes sense or not. So here is a general discussion thread about it:
At the beginning, we looked at various timber frame construction providers, which made us very sensitive in this area. Of course, a ventilation system is quite important here due to the tighter building envelope, which I can fully understand. However, everything is also marketed accordingly...
Since we are now going to decide on a regional solid house provider, completely different questions arise:
I currently have a detailed offer from a solid construction company:
- 10k extra cost for thermal insulation measures
- 13k extra cost for a central ventilation system or 9k extra cost for a decentralized ventilation system
--> Therefore, the repayment bonus of 18k is of little use to me; on the contrary, I even pay extra for it (of course, I get a “better” house as a result)
Key data:
- Single-family city villa 150m² with basement
- Air-water heat pump
- Building material brick
The questions I now ask myself:
1. Is a ventilation system at all necessary to achieve KFW 55?
2. If yes, does it perhaps make more sense to go for KfW70 and “ignore” the subsidy?
3. Is a ventilation system really that great? You also read a lot about noise, maintenance intensity, etc.
4. If yes, for our building project decentralized or centralized? I have read a lot of good and consistently positive things about decentralized, so centralized seems rather out of the question? Correct or not?
5. Does it still work differently with a KfW55? Do you really have to ventilate every 2 hours? Are there any experience reports?
6. Is the KfW55 surcharge of about 10k without a ventilation system justified? Are the prices for the ventilation systems justified?
I know this is an endless topic of discussion and that there are clearly two opinions here. However, we find it incredibly difficult to make a decision here. Maybe a few discussions and information here will motivate us to be able to decide.
we are currently dealing with the technical aspects of our single-family house.
I haven’t found a thread discussing whether a ventilation system generally makes sense or not. So here is a general discussion thread about it:
At the beginning, we looked at various timber frame construction providers, which made us very sensitive in this area. Of course, a ventilation system is quite important here due to the tighter building envelope, which I can fully understand. However, everything is also marketed accordingly...
Since we are now going to decide on a regional solid house provider, completely different questions arise:
I currently have a detailed offer from a solid construction company:
- 10k extra cost for thermal insulation measures
- 13k extra cost for a central ventilation system or 9k extra cost for a decentralized ventilation system
--> Therefore, the repayment bonus of 18k is of little use to me; on the contrary, I even pay extra for it (of course, I get a “better” house as a result)
Key data:
- Single-family city villa 150m² with basement
- Air-water heat pump
- Building material brick
The questions I now ask myself:
1. Is a ventilation system at all necessary to achieve KFW 55?
2. If yes, does it perhaps make more sense to go for KfW70 and “ignore” the subsidy?
3. Is a ventilation system really that great? You also read a lot about noise, maintenance intensity, etc.
4. If yes, for our building project decentralized or centralized? I have read a lot of good and consistently positive things about decentralized, so centralized seems rather out of the question? Correct or not?
5. Does it still work differently with a KfW55? Do you really have to ventilate every 2 hours? Are there any experience reports?
6. Is the KfW55 surcharge of about 10k without a ventilation system justified? Are the prices for the ventilation systems justified?
I know this is an endless topic of discussion and that there are clearly two opinions here. However, we find it incredibly difficult to make a decision here. Maybe a few discussions and information here will motivate us to be able to decide.