ᐅ Where is it most worthwhile to exceed the requirements of the energy-saving regulations?
Created on: 6 Sep 2019 22:48
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hausbauer
Hello,
we are currently planning a solid construction house, and there is some financial flexibility available. Now I am wondering if it would be possible to improve the energy efficiency of the house beyond the originally planned minimal compliance with the 2016 Energy Saving Ordinance requirements. This is not necessarily about return on investment, as I assume that is negative in most cases anyway. It’s more about where it makes the most sense to upgrade the house so that the money isn’t completely wasted and there may also be some comfort benefits (e.g., cooler indoor climate during heatwaves, etc.). The usual KfW subsidies are not attractive for us, so meeting a KfW standard is not the goal.
Conditions planned so far:
- 2 full floors, no basement
- Solid construction with 36.5cm (14.4 inches) Poroton air-filled blocks (requirement: walls should not become thicker)
- Central controlled ventilation system with heat recovery (for comfort reasons)
- Gable roof insulated at the roof structure instead of the upper floor ceiling
- Solar system likely unfavorable due to the roof pitches facing 22° west and east
- Heating with an air-to-water heat pump
What would be the most “sensible” options?
- Poroton blocks with some kind of filling?
- Better insulation under the ground slab?
- Ground-source heat pump? (groundwater level is quite high, is that even possible?)
- Modulating/variable capacity air-to-water heat pump?
- Better windows?
- Better roof insulation?
- Other suggestions?
Or to ask differently, what would you consider the most sensible balance between the Energy Saving Ordinance and KfW 55 standards?
Looking forward to your responses.
Best regards
we are currently planning a solid construction house, and there is some financial flexibility available. Now I am wondering if it would be possible to improve the energy efficiency of the house beyond the originally planned minimal compliance with the 2016 Energy Saving Ordinance requirements. This is not necessarily about return on investment, as I assume that is negative in most cases anyway. It’s more about where it makes the most sense to upgrade the house so that the money isn’t completely wasted and there may also be some comfort benefits (e.g., cooler indoor climate during heatwaves, etc.). The usual KfW subsidies are not attractive for us, so meeting a KfW standard is not the goal.
Conditions planned so far:
- 2 full floors, no basement
- Solid construction with 36.5cm (14.4 inches) Poroton air-filled blocks (requirement: walls should not become thicker)
- Central controlled ventilation system with heat recovery (for comfort reasons)
- Gable roof insulated at the roof structure instead of the upper floor ceiling
- Solar system likely unfavorable due to the roof pitches facing 22° west and east
- Heating with an air-to-water heat pump
What would be the most “sensible” options?
- Poroton blocks with some kind of filling?
- Better insulation under the ground slab?
- Ground-source heat pump? (groundwater level is quite high, is that even possible?)
- Modulating/variable capacity air-to-water heat pump?
- Better windows?
- Better roof insulation?
- Other suggestions?
Or to ask differently, what would you consider the most sensible balance between the Energy Saving Ordinance and KfW 55 standards?
Looking forward to your responses.
Best regards
guckuck2 schrieb:
You could also upgrade the windows to aluminum. It doesn’t offer any energy efficiency benefits, but it does improve quality. As much as I like seeing that I'm not alone in this view here: in my opinion, the added value to the property is not absolute but depends on the architectural level. For a turnkey villa, I would limit that to the front door and lift-and-slide elements.
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https://www.linkedin.com/company/bauen-jetzt/
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hausbauer7 Sep 2019 18:13Hmm, increasing the resale value is not the goal, and I’m quite fine with decent plastic windows. Thicker roof insulation, better insulation under the slab, and cooling options are definitely topics I will discuss with the provider. I remain skeptical about photovoltaic systems, partly because I’m wary of the additional tax-related issues.
I’ll also keep in mind that filled concrete blocks don’t necessarily make you happier...
Thanks for the advice!
One more question: Does a higher-end air-to-water heat pump offer significant advantages over standard models from Vaillant or Alpha Innotec? Or does it mainly depend on the design and sizing of the underfloor heating? I’m skeptical about deep boreholes, and unfortunately, there’s no space for a horizontal ground collector.
I’ll also keep in mind that filled concrete blocks don’t necessarily make you happier...
Thanks for the advice!
One more question: Does a higher-end air-to-water heat pump offer significant advantages over standard models from Vaillant or Alpha Innotec? Or does it mainly depend on the design and sizing of the underfloor heating? I’m skeptical about deep boreholes, and unfortunately, there’s no space for a horizontal ground collector.
If you have a choice, 36.5 cm (14.5 inches) aerated concrete is better than 36.5 cm (14.5 inches) clay blocks. A roof overhang of 60 cm (24 inches) is recommended to protect the facade and provide some shade at midday during the height of summer. Consider a rainwater cistern, as water is expensive. This will always provide a good supply for the garden and other uses like washing the car. Think about installing a charging station for your car. Discuss this with your electrician.
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hausbauer8 Sep 2019 14:29Air wells are a fascinating concept, I hadn’t heard of them before. However, they probably won’t work for me due to temporarily very high groundwater levels.
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hampshire8 Sep 2019 15:31Do you mean "worth it" financially, ecologically, or in terms of comfort?
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