ᐅ Cooling Concept for New Construction – Split Air Conditioning / Air-to-Water Heat Pump Cooling Function / Combination
Created on: 20 Jun 2021 11:49
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Samantheus
Hello everyone,
I am currently planning the construction of a single-family house and am still undecided about the cooling concept. I have attached the current floor plan. Regarding the layouts, I also started a thread in the floor planning forum (https://www.hausbau-forum.de/threads/grundrissplanung-und-platzierung-efh-ca-200qm-auf-900qm-Grundstück.39104/page-4#post-505270).
This is a KfW 55 new build (Poroton brick, reinforced concrete ceiling) with an air-to-water heat pump, controlled ventilation system, and blinds/shutters on all windows. The garden side with the large windows faces southwest, the entrance side faces northeast. The office facing the garden definitely needs air conditioning, as it is in constant use with many technical devices generating significant heat. Otherwise, I personally prefer it quite cool; I usually vacation in Scandinavia but definitely not in Greece, Egypt, or similar. In other words, my comfort temperature is significantly lower than most other people’s.
Now I am considering the best way to cool the house (aside from shading, etc.).
Option 1:
Split air conditioning unit in the office
Option 2:
Split air conditioning unit in the office + cooling function of the air-to-water heat pump (about 5,000 EUR extra)
Option 3:
Split air conditioning unit in the office + living/dining/kitchen area
Option 4:
Split air conditioning unit in the office + living/dining/kitchen area + upper floor hallway (probably only above the stairs, supply temperature— not ideal because cool air might directly sink to the ground floor)
Option 5:
Split air conditioning unit in the office + living/dining/kitchen area + child’s room + child’s room + bedroom
Furthermore, I wonder how big the difference is between installing this as part of the new build or retrofitting it later (significantly more expensive if done afterward? Potential issues with KfW 55 standards?).
Also, I am unsure whether to use one split unit per room or a multi-split system. Currently, I have no concrete offers with prices.
Thank you in advance!
Best regards,
Sam
Views:
Floor plans:
I am currently planning the construction of a single-family house and am still undecided about the cooling concept. I have attached the current floor plan. Regarding the layouts, I also started a thread in the floor planning forum (https://www.hausbau-forum.de/threads/grundrissplanung-und-platzierung-efh-ca-200qm-auf-900qm-Grundstück.39104/page-4#post-505270).
This is a KfW 55 new build (Poroton brick, reinforced concrete ceiling) with an air-to-water heat pump, controlled ventilation system, and blinds/shutters on all windows. The garden side with the large windows faces southwest, the entrance side faces northeast. The office facing the garden definitely needs air conditioning, as it is in constant use with many technical devices generating significant heat. Otherwise, I personally prefer it quite cool; I usually vacation in Scandinavia but definitely not in Greece, Egypt, or similar. In other words, my comfort temperature is significantly lower than most other people’s.
Now I am considering the best way to cool the house (aside from shading, etc.).
Option 1:
Split air conditioning unit in the office
Option 2:
Split air conditioning unit in the office + cooling function of the air-to-water heat pump (about 5,000 EUR extra)
Option 3:
Split air conditioning unit in the office + living/dining/kitchen area
Option 4:
Split air conditioning unit in the office + living/dining/kitchen area + upper floor hallway (probably only above the stairs, supply temperature— not ideal because cool air might directly sink to the ground floor)
Option 5:
Split air conditioning unit in the office + living/dining/kitchen area + child’s room + child’s room + bedroom
Furthermore, I wonder how big the difference is between installing this as part of the new build or retrofitting it later (significantly more expensive if done afterward? Potential issues with KfW 55 standards?).
Also, I am unsure whether to use one split unit per room or a multi-split system. Currently, I have no concrete offers with prices.
Thank you in advance!
Best regards,
Sam
Views:
Floor plans:
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JoachimG.20 Jun 2021 20:25Strahleman schrieb:
At least for the Nuremberg area, your estimate is pretty accurate. Here, 4 indoor units plus an 8.3kW (28,300 BTU) multi-split outdoor unit cost just under 10,000 euros, and the installation is about 6,000 euros (new build).
If you are considering air conditioning, I would recommend planning it during the new build. Refrigerant lines and condensate drains can be neatly routed within the walls, and above all, you can respond individually to any issues and usually solve them fairly easily. That is not always possible in an existing house. In my case, for the Nuremberg region, it was 3,500 euros for the installation of the 5 units plus the multi-split, even during the shell construction phase. Perhaps the price difference is because all the lines run through suspended ceilings here.
I installed a Daikin multisplit system in an older building with 4 indoor units (covering approximately 100m² (1,076 sq ft), although the cubic meters are more relevant). Three of the units are located in the attic, with the outdoor unit on the roof. We paid just under €12,000 (including installation), with the main cost drivers being the outdoor unit and the refrigerant piping, which I believe costs about €30 per meter (approximately $9 per foot). The entire installation was done by a professional company with an invoice. Three of the four units drain condensate directly to the basement, while one has a separate condensate pump. In the basement, there is also a larger condensate pump installed. The installation took place last year.
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Samantheus21 Jun 2021 15:13Thank you for the replies!
We are also building roughly near Nuremberg (more precisely Bamberg), so I wanted to contact the "Nuremberg locals" by private message to ask if you have any recommendations for a company you had a good experience with. Unfortunately, that was not possible because I have too few posts so far. So if anyone can recommend a company in the region, I would greatly appreciate a tip or a private message.
We are also building roughly near Nuremberg (more precisely Bamberg), so I wanted to contact the "Nuremberg locals" by private message to ask if you have any recommendations for a company you had a good experience with. Unfortunately, that was not possible because I have too few posts so far. So if anyone can recommend a company in the region, I would greatly appreciate a tip or a private message.
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Samantheus24 Jun 2021 18:07I have now received an initial offer for a DAIKIN R32 multi-split outdoor unit and a total of 5 [I]DAIKIN R32 Comfora wall-mounted units[/I] for approximately 19,000 EUR (including installation). Compared to your figures, this seems quite high to me, so I will look for alternative offers. Have you generally had good experience with Daikin and are you satisfied?
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bauenmitschaf24 Jun 2021 19:27Maybe another alternative idea: Your sketch looks almost like reinforced concrete slabs on the ground floor and first floor, right? In this case, thermal activation of the concrete slabs could be a good option. This would allow you to cool very effectively (ideally combined with a brine-water heat pump with passive cooling) and also lower the supply temperature during heating (increasing efficiency and the self-regulating effect). Additionally, a split air conditioning unit could be used for dehumidification.
In total, with
- thermal slab activation
- brine-water heat pump (optional)
- 1-2 split air conditioning units
this is probably achievable well below 19,000 EUR.
PS: An extra cost of around 5,000 EUR for the cooling function of the air-water heat pump seems quite high to me.
In total, with
- thermal slab activation
- brine-water heat pump (optional)
- 1-2 split air conditioning units
this is probably achievable well below 19,000 EUR.
PS: An extra cost of around 5,000 EUR for the cooling function of the air-water heat pump seems quite high to me.
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