Hello everyone,
During the planning phase of building a house, you inevitably come across forums about home construction and topics related to energy standards. I have already read several books and browsed various websites on the subject. I should mention that I am not a professional in this field. What I have noticed is that the entire topic of "economic / ecological home construction" is heavily influenced by commercial interests. The so-called "smart" consumer is often misled by marketing terms and a government-led campaign for "CO2-efficient building." Books or websites dealing with this subject often do not provide clear, comprehensive assessments.
In the "better" literature, insulation materials are compared in terms of insulation value and whether they are expensive or affordable. However, I still cannot determine what makes the most sense for my individual case. I simply do not want to spend excessive amounts of money, especially on things that do not add value, such as polystyrene insulation. If additional costs for a particular heating system are reasonable over a feasible period, then yes.
Our current goal is to build a simple single-family home with about 130 - 140 sqm (1400 - 1500 sq ft). The house should cost around €200,000 (without outdoor landscaping, floor coverings, land, or additional construction-related costs; our expectations are modest).
I am interested in knowing, based on the current state of technology, what is the most energy-efficient and cost-effective building option?
Energy-saving regulation / building standards according to KfW, yes or no, and if yes, which level?
Solid construction or prefabricated house?
Condensing boiler technology or heat pump?
Thank you very much for your answers!
Best regards
During the planning phase of building a house, you inevitably come across forums about home construction and topics related to energy standards. I have already read several books and browsed various websites on the subject. I should mention that I am not a professional in this field. What I have noticed is that the entire topic of "economic / ecological home construction" is heavily influenced by commercial interests. The so-called "smart" consumer is often misled by marketing terms and a government-led campaign for "CO2-efficient building." Books or websites dealing with this subject often do not provide clear, comprehensive assessments.
In the "better" literature, insulation materials are compared in terms of insulation value and whether they are expensive or affordable. However, I still cannot determine what makes the most sense for my individual case. I simply do not want to spend excessive amounts of money, especially on things that do not add value, such as polystyrene insulation. If additional costs for a particular heating system are reasonable over a feasible period, then yes.
Our current goal is to build a simple single-family home with about 130 - 140 sqm (1400 - 1500 sq ft). The house should cost around €200,000 (without outdoor landscaping, floor coverings, land, or additional construction-related costs; our expectations are modest).
I am interested in knowing, based on the current state of technology, what is the most energy-efficient and cost-effective building option?
Energy-saving regulation / building standards according to KfW, yes or no, and if yes, which level?
Solid construction or prefabricated house?
Condensing boiler technology or heat pump?
Thank you very much for your answers!
Best regards
S
Steffen808 Aug 2017 17:28Nordlys schrieb:
Back to the house. I grew up with shipping, which has a very Anglo-Saxon approach. Motto: Keep it simple, rugged, seaworthy. Functionality, ease of maintenance, operational reliability, minimal control technology, lots of mechanics that can be repaired even in Mombasa...that mindset isn’t wrong when it comes to building systems either. The cheapest investment is always the one where the technician never has to come. Therefore: gas, basic ventilation control, solar only for hot water, no mechanical ventilation with heat recovery, no KNX, no smart home, no steam oven, no AAAAA++++ dishwasher, no fancy gadgets. That’s how I see things. KarstenYou can also just keep living in a cave. That’s even cheaper...to me, it sounds like people who always tell me, “You with your tech-packed Audi...if something breaks, it’s constant trips to the workshop.” Funny enough, I’ve been driving those cars for over 10 years and NEVER had an issue. Meanwhile, others keep running to the garage because their “no-tech” cars break down.
It’s also funny when people say, “You with your KNX and fancy stuff...what if the power goes out?” Well, what then? The lights go out for me just like they do for you! Only difference is that my system bus (including alarm, smoke detectors, etc.) is still online thanks to the UPS…
D
daniels878 Aug 2017 17:58toxicmolotow schrieb:
Seriously? If you make this argument (which is probably justified), at least back it up with realistic figures.
If your house needs 50 euros per month for the heat pump, 10 euros for additional electric heating is just a drop in the ocean.Why? Those are only a few days in winter. Over the course of the year, it balances out.
Bieber0815 schrieb:
Footnote: Furthermore, it is assumed that the solar power generated during the day can be used to charge the car at night.)A small misunderstanding. The public grid is actually the largest storage system a private photovoltaic operator can wish for. You receive 12.3 cents/kWh for feeding electricity into the grid and can buy it back at any time for 25–28 cents (depending on individual conditions). This means the effective storage cost is about 13–16 cents. In other words, the storage loss is roughly 50%.
A privately operated battery storage system has a technical loss of about 20%, plus the drawn electricity is subject to sales tax (around 4 cents, plus an additional 15% storage loss). This amounts to approximately 35% loss. Additionally, there's the purchase price of the battery storage—for example, €6000 for a 6 kWh battery. One can expect about 250 full charge cycles (optimistically!), and the manufacturers usually guarantee 10 years; beyond that is uncertain. Calculated over 10 years: 250 cycles × 6 kWh = 15,000 kWh of stored and usable energy (optimistic and simplified). Comparing this to the purchase price results in about 40 cents per kWh just from the acquisition cost, plus the additional 150% storage loss. Altogether, this leads to roughly 185% storage loss with decentralized storage versus 50% loss when feeding into the grid and buying back electricity at any time.
Only direct consumption is (significantly) cheaper.
B
Bieber08158 Aug 2017 21:52Alex85 schrieb:
Only direct consumption is (significantly) cheaper. That’s what I assumed; I wasn’t aware of the detour through the public grid. Then we can get started... If we ever have an electric car, I’ll consider it.
We built a one-and-a-half-story house (140 m² / 1,507 sq ft) in 2015/16 and moved in May 2016 for $163,000, excluding utility connections, painting, and some flooring.
With everything included—land, additional building costs, carport, fence, topsoil, paving the driveway and terrace, furnishings (cabinets, kitchen, etc.)—we paid around $290,000.
Everyone needs to account for inflation and the new energy-saving regulations; the house would probably cost about $170,000 today.
To answer the question, we built quite simply with 36.5 cm (14 inches) thick masonry walls, triple-glazed windows, a gas condensing boiler, and solar water heating on the roof.
If the system on the roof ever breaks down, it will simply be disconnected and that's it.
With everything included—land, additional building costs, carport, fence, topsoil, paving the driveway and terrace, furnishings (cabinets, kitchen, etc.)—we paid around $290,000.
Everyone needs to account for inflation and the new energy-saving regulations; the house would probably cost about $170,000 today.
To answer the question, we built quite simply with 36.5 cm (14 inches) thick masonry walls, triple-glazed windows, a gas condensing boiler, and solar water heating on the roof.
If the system on the roof ever breaks down, it will simply be disconnected and that's it.
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