Hello community!
We are building with high thermal insulating thermobricks, but only to the Energy Saving Ordinance standard. So far, no KfW55 level, more like KfW70 if you will. The extra cost for better insulation is 7,800€ plus either a photovoltaic system or 4 decentralized ventilation units.
(We don’t have a central controlled ventilation system installed. That’s a separate topic. My wife doesn’t want it and money is tight.)
You have to subtract a 5,000€ grant but add back about 1,500€ for the KfW certification. The subsidized interest rates don’t really offer any advantage or are even worse than regular financing options.
In the end, there are roughly 8,000€ additional costs that you would have to save with reduced energy consumption.
1. Does this take forever? What do you think?
KfW55 will become mandatory by law in 2021. Soon our house would therefore be energy-wise outdated and probably worth less. But KfW70 was still subsidized two years ago and is actually quite good already, right?
2. Even if it might not be economically worthwhile today, would you still opt for better insulation?
3. Can an air-to-water heat pump be operated without issues in a house built to Energy Saving Ordinance standards, or would it then become a major electricity consumer?
We are building with high thermal insulating thermobricks, but only to the Energy Saving Ordinance standard. So far, no KfW55 level, more like KfW70 if you will. The extra cost for better insulation is 7,800€ plus either a photovoltaic system or 4 decentralized ventilation units.
(We don’t have a central controlled ventilation system installed. That’s a separate topic. My wife doesn’t want it and money is tight.)
You have to subtract a 5,000€ grant but add back about 1,500€ for the KfW certification. The subsidized interest rates don’t really offer any advantage or are even worse than regular financing options.
In the end, there are roughly 8,000€ additional costs that you would have to save with reduced energy consumption.
1. Does this take forever? What do you think?
KfW55 will become mandatory by law in 2021. Soon our house would therefore be energy-wise outdated and probably worth less. But KfW70 was still subsidized two years ago and is actually quite good already, right?
2. Even if it might not be economically worthwhile today, would you still opt for better insulation?
3. Can an air-to-water heat pump be operated without issues in a house built to Energy Saving Ordinance standards, or would it then become a major electricity consumer?
I have to say that I love my ventilation system. I wouldn’t want to live without it anymore. Especially during larger gatherings in the house, I really notice the difference.
The neighbors have window frame ventilation with some sort of strange fan. When they were installing their kitchen and lots of sweaty workers were moving around the ground floor, it was running at full speed, which could unfortunately be heard in the living room as well. I don’t know if it was just set up incorrectly, but it wasn’t pleasant.
The neighbors have window frame ventilation with some sort of strange fan. When they were installing their kitchen and lots of sweaty workers were moving around the ground floor, it was running at full speed, which could unfortunately be heard in the living room as well. I don’t know if it was just set up incorrectly, but it wasn’t pleasant.
Nordlys schrieb:
I never hear it in the living room. And besides, how do the neighbors feel about the device? It’s humanly understandable that you don’t like this cheap solution as much as your expensive one. Karsten
I wouldn’t call it a cheap solution. The unit (meaning the entire system) was almost as expensive as our ventilation systems. They currently have it turned off. They have only lived in the house for 2 weeks. When the kitchen was installed, they were surprised by how loud the unit was under heavy load. A noticeable humming, which could even be heard from the hallway. But as I said, it’s possible that something isn’t properly adjusted.We intentionally chose the KfW55 standard. The additional cost for us was €5,000, which is exactly the amount of the subsidy received. We wanted a controlled ventilation system anyway to manage airflow and humidity in the house.
For €5,000, we had to increase the insulation by 2cm (1 inch) all around; more than that was not necessary. We heat with gas combined with solar thermal energy. I would not recommend an air-to-water heat pump, as the humming noise makes it impossible to sleep.
For €5,000, we had to increase the insulation by 2cm (1 inch) all around; more than that was not necessary. We heat with gas combined with solar thermal energy. I would not recommend an air-to-water heat pump, as the humming noise makes it impossible to sleep.
munger71 schrieb:
We deliberately chose KfW55 standard. The additional cost for us was 5,000 euros, which is exactly the amount of the government subsidy. We wanted a mechanical ventilation system anyway because of the airflow and humidity inside the house.
For 5,000 euros, we had to increase the insulation thickness by 2cm (1 inch) all around, but no more was necessary. We heat with gas including solar thermal energy. I wouldn’t choose an air-to-water heat pump; with the humming noise, no one can get any sleep. What humming noise? I mean, it would also be unwise to place the unit next to the bed.Our neighbor has a system like that. An air-to-water heat pump installed indoors. I can hear the humming very clearly at night. We sleep about 10–15m (33–49 feet) away... I can hear the noise distinctly. Not for sensitive people. I’m already looking forward to our new home... no air-to-water heat pump anywhere nearby.
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