ᐅ Cooling Concept for New Construction – Split Air Conditioning / Air-to-Water Heat Pump Cooling Function / Combination

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

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