Hello,
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
Nordlys schrieb:
But my feeling is that controlled residential ventilation owners are like a sort of New Jehovah’s Witnesses group, or Scientology with an added fan. And then there’s resistance inside me. The little devil, the mischievous Karsten demon, just doesn’t want to be converted.*grin*
Caspar2020 schrieb:
On one hand, we want and need to build ever more energy-efficiently and often use blower door tests to identify even the smallest leaks; on the other hand, we tear open holes the size of square meters / preferably cross-ventilate / to expel heat in cubic meters out of the house.Oh, how wonderfully efficient a house could be if it weren’t for the occupants.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
I have a house without a mechanical ventilation system with heat recovery, as it was not feasible during construction. In every room, I have permanently installed humidity sensors that notify me when I need to ventilate. Except for after showering in the bathroom, all readings have so far stayed within acceptable limits – even in the bedroom in the morning, although I still ventilate then. Air exchange is ensured through window frame ventilators, and the building still meets the KfW 55 energy standard. A mechanical ventilation system with heat recovery would certainly have provided a bit more comfort, but it would not have saved much energy or any significant costs.
The amount of heat lost through air exchange is negligible.
Of course, I would have chosen a mechanical ventilation system with heat recovery if it were possible, but the worst-case scenarios discussed here are completely exaggerated. Home automation brings me much greater comfort. Just lying in bed on a weekend morning and slowly opening all the roller shutters via smartphone without having to get up... Or accidentally falling asleep and then turning off all the lights with a single button press without having to walk through the whole house...
Still, it was possible to manage for years even in the old house without it.
The amount of heat lost through air exchange is negligible.
Of course, I would have chosen a mechanical ventilation system with heat recovery if it were possible, but the worst-case scenarios discussed here are completely exaggerated. Home automation brings me much greater comfort. Just lying in bed on a weekend morning and slowly opening all the roller shutters via smartphone without having to get up... Or accidentally falling asleep and then turning off all the lights with a single button press without having to walk through the whole house...
Still, it was possible to manage for years even in the old house without it.
B
Bieber08153 May 2017 09:37Kaspatoo schrieb:
I find it a bit surprising that none of the long-term owners have ever conducted a microbial analysis after several years and shared the results. Given the experience of multiple owners, this would be a strong argument and even in their own interest. But please correct me if I’m wrong, I haven’t found anything except minor comments.Why should anyone do that? Such an analysis is usually only performed when there is a reason, which I don’t see here.To the moderators,
perhaps you could move the topic about controlled residential ventilation elsewhere, as in my opinion it doesn’t help Judith82 here.
Hello,
You can expect about 100 watts running _continuously_. That’s at least the case for us. In other words, the electricity consumption of the system (around €20 per month) can never be fully saved on gas. Not to mention the filters, which should be replaced every 6 months. Altogether, you’re easily looking at operating costs of €250–300 per year for the mechanical ventilation system with heat recovery.
Such a system will never pay off directly in financial terms. It’s definitely more about the increase in comfort and, if applicable, it might allow you to omit basement windows and solar thermal panels on the roof. Thanks to the mechanical ventilation system, we were able to leave those out. Overall, the system has cost us less than €2,000, and for that comfort, it’s worth it to me.
Another positive aspect that’s often overlooked: I had severe hay fever as a child, and I really hope my children are spared from that. If they do catch it, a mechanical ventilation system with pollen filters is priceless!
Best regards,
Andreas
toxicmolotow schrieb:
Now it’s getting interesting... regarding energy efficiency and all that. How many watts does a mechanical ventilation system with heat recovery use?
You can expect about 100 watts running _continuously_. That’s at least the case for us. In other words, the electricity consumption of the system (around €20 per month) can never be fully saved on gas. Not to mention the filters, which should be replaced every 6 months. Altogether, you’re easily looking at operating costs of €250–300 per year for the mechanical ventilation system with heat recovery.
Such a system will never pay off directly in financial terms. It’s definitely more about the increase in comfort and, if applicable, it might allow you to omit basement windows and solar thermal panels on the roof. Thanks to the mechanical ventilation system, we were able to leave those out. Overall, the system has cost us less than €2,000, and for that comfort, it’s worth it to me.
Another positive aspect that’s often overlooked: I had severe hay fever as a child, and I really hope my children are spared from that. If they do catch it, a mechanical ventilation system with pollen filters is priceless!
Best regards,
Andreas
Bieber0815 schrieb:
To the moderation team,
maybe you could move the controlled residential ventilation topic elsewhere, as in my opinion it doesn’t help Judith82 here.@Admin
Brief regards
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