Can a geothermal basket precondition the air for controlled residential ventilation?

Thanks to your keywords, I think I am getting closer.

Currently planned is a Zehnder ComfoAir; if I interpret it correctly as an ABSOLUTE layman, for the project with a geothermal basket, in addition to the ComfoAir, the ComfoFond-L geothermal heat exchanger is needed as well, so another upstream device plus, of course, the geothermal basket with all the necessary parts.

I think the air conditioning here will not only be more reasonable, as explained by rick2018 (since photovoltaics will be available), but ultimately also almost the same price, with significantly higher efficiency. All pure assumptions on my part; it would be nice if someone with expertise could confirm this regarding the upstream geothermal heat exchanger and the geothermal basket.

Underfloor cooling is especially beneficial when you cannot ventilate out the heat. Here in the office, we have the problem that between 7 p.m. and 7 a.m. no one is there, and therefore no one can ventilate the heat out. With underfloor cooling, it only starts at 24 degrees in the morning instead of 28 degrees. The problem is not just the air but that a building made of reinforced concrete stores an incredible amount of heat. Once it is heated up, you can’t just ventilate the heat out again in a few hours. Underfloor cooling takes the heat from the walls, floors, and ceilings.

Since underfloor cooling is definitely set up for us, I thought that with the additional concept of "geothermal basket & controlled residential ventilation" I could postpone the use of the air conditioning system by several years. This might still work for quite a while, but since costs also play a role and the air conditioning pre-installation should definitely be done, this plan will probably fall through...

I think the air conditioning will not only be more sensible here, as just explained by rick2018 (since there will be photovoltaics), but overall also almost the same price, with significantly higher efficiency. All pure assumptions on my part, it would be great if someone with expertise could confirm that with the upstream geothermal heat exchanger and the geothermal basket.

Exactly. Since all other parameters (climate preparation, photovoltaics ...) are already met, I would save all other costs for the geothermal basket, etc., and go directly for the air conditioning. In terms of cost, you will probably not be worse off, but significantly more effective regarding the desired cooling AND dehumidification. Even one device in the upper floor should be able to contribute significantly to cooling.

We have been living since last year in a KfW40 house with a timber frame construction (with a solid basement). We could passively cool with the ground-source heat pump and have also prepared for air conditioning. We have dispensed with an air well or geothermal heat exchanger - that was too much effort for too little expected result (it was already said, air is a poor medium for this). This summer we tried what is possible only with shading and ventilation: ventilation during the day on minimum, at night on the second highest level, in the morning and evening on the highest level. With this, we were always around 22 to a maximum of 24 degrees in the upper and ground floors, except up to 26 degrees in the evening in the open living area with kitchen and 20-23 degrees in the basement. Currently, we have therefore also put the cooling via the underfloor heating on hold. So if shading and ventilation can be done well, such a house remains very comfortable.

Thank you for your testimonial, that gives hope... I still have a few questions for you. Let's start with the easy ones :). What is an all-room? Kitchen with dining room? And does "hintengestellt" mean turned off, set, in other words off? May I ask who installed your house? We are also building with a massive basement and I actually find your temperatures great except for the all-room! Who is your controlled residential ventilation from? Can you program it the way you just described or do you have to take care of it manually? Why didn’t you turn on the underfloor cooling to get the temperature in the all-room a bit lower? So you are doing this year completely without extra windows open at night? May I also ask where you live, just the region is enough... I’m located in southern Germany and it is often noticeably warmer there than, for example, in the north.

I would no longer describe 26°C dehumidified air as very pleasant. according to the profile, it is Bavaria.