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haus_bau20258 Sep 2024 17:06Hello everyone,
My wife and I are currently planning to build our single-family home with about 140 m2 (1507 sq ft). Our construction company has now presented us with an offer that includes a decentralized air source heat pump as the standard option, which seems to be a topic of varied opinions here in the forum. Alternatively, we could choose an exhaust air heat pump with controlled heat recovery (additional cost about 6000 Euros) or a centralized mechanical ventilation system with heat recovery (additional cost about 14000 Euros). Since we are still undecided whether to build to the KFW 40 standard (for cost reasons), we are torn between which option to choose. We assume that the centralized system is probably the "best" in terms of comfort. However, for financial reasons, we would like to see if one of the other two options could also be suitable. Specifically, we are interested in:
1.) What are the noise emissions like with a decentralized system? Would you choose a system like this again as homeowners?
2.) How significant is the added value of a controlled centralized mechanical ventilation system with heat recovery compared to a decentralized one? Is it really a genuine alternative to the decentralized system?
3.) Is a controlled mechanical ventilation system a requirement for KFW 40 funding? If yes, is the mid-level option at around 6000 Euros sufficient, or is the more comprehensive system costing 14000 Euros necessary?
If you have any other ideas or suggestions, please share them!
My wife and I are currently planning to build our single-family home with about 140 m2 (1507 sq ft). Our construction company has now presented us with an offer that includes a decentralized air source heat pump as the standard option, which seems to be a topic of varied opinions here in the forum. Alternatively, we could choose an exhaust air heat pump with controlled heat recovery (additional cost about 6000 Euros) or a centralized mechanical ventilation system with heat recovery (additional cost about 14000 Euros). Since we are still undecided whether to build to the KFW 40 standard (for cost reasons), we are torn between which option to choose. We assume that the centralized system is probably the "best" in terms of comfort. However, for financial reasons, we would like to see if one of the other two options could also be suitable. Specifically, we are interested in:
1.) What are the noise emissions like with a decentralized system? Would you choose a system like this again as homeowners?
2.) How significant is the added value of a controlled centralized mechanical ventilation system with heat recovery compared to a decentralized one? Is it really a genuine alternative to the decentralized system?
3.) Is a controlled mechanical ventilation system a requirement for KFW 40 funding? If yes, is the mid-level option at around 6000 Euros sufficient, or is the more comprehensive system costing 14000 Euros necessary?
If you have any other ideas or suggestions, please share them!
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nordanney8 Sep 2024 17:53haus_bau2025 schrieb:
the standard version includes a decentralized air-source heat pump 1. The central system is the best (and most expensive) option.
2. A central system should be installed in new construction.
3. Decentralized systems are best suited for renovation projects (I have one in my current house).
4. Decentralized units are visually noticeable and generally (significantly) louder.
5. Both systems perform equally in terms of effectiveness.
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RotorMotor8 Sep 2024 20:34Are the decentralized air heat pumps used only for heating and cooling, or do they also provide ventilation?
Is there no underfloor heating planned at all?
Is there no underfloor heating planned at all?
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Benutzer 10018 Sep 2024 21:20Decentralized systems and wind noise, plus electricity consumption—this is something you cannot willingly accept in a new build. Depending on the region, these units run at full capacity during winter.
Look at the Facebook pages of Weberhaus and Schwörerhaus. There are plenty of affected people who are surprised by this.
If anything, go for a central system with heat recovery and an air-to-water heat pump.
Look at the Facebook pages of Weberhaus and Schwörerhaus. There are plenty of affected people who are surprised by this.
If anything, go for a central system with heat recovery and an air-to-water heat pump.
haus_bau2025 schrieb:
1.) What are the noise emissions like with a decentralized system? As homeowners, would you choose such a system again?
2.) What is the added value of a decentralized system compared to a controlled centralized residential ventilation system with heat recovery? Is it even a realistic alternative to a decentralized system?
[ << ] Since we are still undecided whether to build to KFW 40 standard (for cost reasons), we are currently torn about which option to choose. 1. Decentralized systems cannot pool their operation, so they generally suffer higher efficiency losses overall because each subsystem (and all of them combined) more often run outside their optimal speed range. Their noise emissions at different locations not only add up to a higher overall level than those of a centralized system, but they also interfere with each other. Simply put, they tend to sound “louder” and more “unpleasant.”
2. Decentralized systems only make sense where they are not intended to serve the entire building but where controlled ventilation is desired only in certain areas—especially if the “non-served” areas outweigh the “served” ones.
3. The EH40 standard will pay off for “average consumers” with the perspective of becoming “retired poor” at some far-off point in the indefinite future. If you are a high earner, have capital income and tax advantages contributing more to your wealth building than employment income, and want to set an environmentally progressive example within your social circle, then go for EH40. Anyone expecting the KfW to enable such action for average earners is dreaming.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
1. Decentralized systems cannot be pooled, so they practically always operate with higher overall efficiency losses because each subsystem individually (and all together) more frequently operates "outside the optimal speed range." ... operate / operates
is of course the correct term.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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