Hello,
we are currently visiting different construction companies. Everything from KfW100 to KfW55 standards is being offered. Regarding building services, whether heat pumps or gas condensing boilers combined with solar technology for hot water, we are still undecided ourselves.
Now we are wondering if KfW100 would basically be sufficient. With KfW75, there would be an interest rate advantage through subsidies, but I am not sure about that yet, nor have I calculated whether this interest rate benefit is worth it compared to the additional costs of a KfW75 house.
Is there a significant difference in terms of energy performance and costs between KfW100 and KfW75 that justifies the extra expense?
we are currently visiting different construction companies. Everything from KfW100 to KfW55 standards is being offered. Regarding building services, whether heat pumps or gas condensing boilers combined with solar technology for hot water, we are still undecided ourselves.
Now we are wondering if KfW100 would basically be sufficient. With KfW75, there would be an interest rate advantage through subsidies, but I am not sure about that yet, nor have I calculated whether this interest rate benefit is worth it compared to the additional costs of a KfW75 house.
Is there a significant difference in terms of energy performance and costs between KfW100 and KfW75 that justifies the extra expense?
P
perlenmann2 Sep 2014 14:14klblb schrieb:
Where is €uro, by the way? 😀 Strange, isn’t it? I’ve been missing him too. In the other forum, he really went a bit overboard and probably needs a week off :pB
Bauexperte2 Sep 2014 14:29Bauexperte schrieb:
Good evening,
"The energy demand of a KfW 70 efficiency house is lower than that of a single-family house built purely according to the Energy Saving Ordinance. A KfW efficiency house 70 requires only 70 percent of the energy of the reference building defined in the Energy Saving Ordinance = 100%. The smaller the number (KfW 55, 40, or Passive House), the more energy is saved; the higher the subsidy from KfW." This is an excerpt from the explanation on the KfW website.
The step from the reference building to KfW 70 is not so expensive; most providers today already include underfloor heating as standard. What is usually missing is a heat pump; at least a ventilation system with heat recovery if a gas condensing boiler is installed. Additional cost for a ventilation system with heat recovery is about EUR 8,000-9,000.
Now you can calculate yourself, considering rising energy costs, when a KfW 70 efficiency house pays off 😉
Regards, BauexperteVery general but absolutely correct!
What is the additional cost for the mechanical ventilation based on?
From when does what become cost-effective?
😉
B
Bauexperte6 Sep 2014 00:22Good evening,
Regards, Bauexperte
vokono schrieb:What do you mean?
Very general but absolutely correct!
vokono schrieb:Controlled residential ventilation with heat recovery
What is the additional cost for controlled residential ventilation based on?
vokono schrieb:This cannot be answered in general terms; every construction project must be considered individually, as it depends on many factors, including budget and environmental concerns. Roughly speaking, it can only be stated that if you build according to KfW 70 standards, you achieve the best cost-benefit ratio between investment and energy savings.
From when does it become cost-effective?
Regards, Bauexperte
Told you!
Very roughly!
And what do you get if I build better than Eff 70?
Are all these homeowners just foolish and have too much money, or are they just thinking too green? 🙄
My general advice:
Always build a little better than required! Sustainable, of course!! 😎
Technology (e.g., heat generators) is usually replaceable and is constantly being developed and improved.
Everything in between is a gray area and up to each individual's imagination.
Oh God, now it’s getting ethical 😉
Very roughly!
And what do you get if I build better than Eff 70?
Are all these homeowners just foolish and have too much money, or are they just thinking too green? 🙄
My general advice:
Always build a little better than required! Sustainable, of course!! 😎
Technology (e.g., heat generators) is usually replaceable and is constantly being developed and improved.
Everything in between is a gray area and up to each individual's imagination.
Oh God, now it’s getting ethical 😉
B
Bauexperte9 Sep 2014 00:13Good evening,
Best regards, Bauexperte
vokono schrieb:Many of them have simply received poor advice. So "silly" is the wrong word here 😉
Are all those homeowners just silly with too much money, or are they too green? 🙄
Best regards, Bauexperte
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