Hello,
I am planning to build a KFW-55 two-family house. The living area on the ground floor is about 100 m² (1,076 sq ft) and on the upper floor about 90 m² (969 sq ft). The house will have a full basement. I will live on the ground floor and rent out the upper floor.
I have visited several construction companies to get quotes for turnkey building. During these meetings, I encountered many different opinions regarding ventilation systems—far more than I expected. Ventilation was the main topic in all discussions, even though I want a fairly complex KNX installation.
Basically, it comes down to the following points:
Central ventilation system
Since it will be a two-family house, this is supposedly complicated due to soundproofing requirements. There was also the idea of installing two smaller systems, one for each apartment. Furthermore, I was advised against a central ventilation system because it needs thorough cleaning at least every two years, costing around 3,000 euros (about 3,300 US dollars). Otherwise, mold could develop in the ducts, which could lead to health issues.
Decentralized ventilation system
I was repeatedly recommended a decentralized ventilation system. Since there are no long ducts, maintenance would be much simpler. However, I am not a fan of this because then the noise of the fans would shift from the basement to the living areas. Also, I would prefer to avoid having ventilation outlets on the facade.
No ventilation system at all
The energy consultant suggested skipping the ventilation system altogether, noting that KFW-55 standards can also be achieved without one. Of course, manual ventilation is possible, but if I leave for work in the morning after showering, no one will close the window afterwards. So I don’t really see this as an option.
Now I have to choose between three unfavorable options. Ideally, I would prefer a central system since any noise would then occur, if at all, in the basement.
I would be very grateful for any tips, opinions, and experiences.
I am planning to build a KFW-55 two-family house. The living area on the ground floor is about 100 m² (1,076 sq ft) and on the upper floor about 90 m² (969 sq ft). The house will have a full basement. I will live on the ground floor and rent out the upper floor.
I have visited several construction companies to get quotes for turnkey building. During these meetings, I encountered many different opinions regarding ventilation systems—far more than I expected. Ventilation was the main topic in all discussions, even though I want a fairly complex KNX installation.
Basically, it comes down to the following points:
Central ventilation system
Since it will be a two-family house, this is supposedly complicated due to soundproofing requirements. There was also the idea of installing two smaller systems, one for each apartment. Furthermore, I was advised against a central ventilation system because it needs thorough cleaning at least every two years, costing around 3,000 euros (about 3,300 US dollars). Otherwise, mold could develop in the ducts, which could lead to health issues.
Decentralized ventilation system
I was repeatedly recommended a decentralized ventilation system. Since there are no long ducts, maintenance would be much simpler. However, I am not a fan of this because then the noise of the fans would shift from the basement to the living areas. Also, I would prefer to avoid having ventilation outlets on the facade.
No ventilation system at all
The energy consultant suggested skipping the ventilation system altogether, noting that KFW-55 standards can also be achieved without one. Of course, manual ventilation is possible, but if I leave for work in the morning after showering, no one will close the window afterwards. So I don’t really see this as an option.
Now I have to choose between three unfavorable options. Ideally, I would prefer a central system since any noise would then occur, if at all, in the basement.
I would be very grateful for any tips, opinions, and experiences.
B
Bau-Schmidt5 Nov 2017 21:34The seller is telling you stories. Two central ventilation systems and that’s it.
D
Deliverer6 Nov 2017 10:01The noise issues from decentralized systems shift to rooms where people do not "live," such as the utility room and bathrooms. Therefore, this is not disruptive.
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