Exhaust Air Heat Pump vs. Ground Source Heat Pump

Hello!

Well, the title already says it: What are the advantages and disadvantages of an exhaust air heat pump compared to a ground source heat pump?

If I understand correctly, you don't need to do any drilling with an exhaust air heat pump, so it is supposed to be cheaper to purchase and install. Is that right? But otherwise? Are both suitable for cooling well? Can any general statements be made about the profitability? Does anything else come to mind?

Thank you in advance for your answers.

So... where does an exhaust air heat pump get its air from, from which it is supposed to extract energy to heat the house and also produce hot water? How cold is it outside in winter? How high are the losses of the house to the outside - especially on dull winter days?

Despite everything, an exhaust air heat pump can work - but some things have to be considered - from sunlight to insulation and the heat demand of the occupants. Yes, that is actually a topic for very fundamental planning - mostly not for planning by the home builder (although - there are certainly positive exceptions there too), but there are specialists for that.
And cooling in midsummer - at just under 30° average weekly temperature, which we had last summer - that is not possible with a normal heating system, but requires a specialized air conditioning system...

Isn't it the case that an exhaust air heat pump is integrated into a controlled residential ventilation system? At least that's how I understood it. But since I haven't built anything like that, I'm not familiar with it. Also not how the cooling works.

But I do know my geothermal heat pump, and technically it cannot cool. But there are versions that can do that.

However, you usually get underfloor heating with it, which is used for heating. And whether you want a cold floor in summer... I wouldn't want that at all. My feet start hurting quite quickly then. And you have to make sure that nothing condenses anywhere. That needs to be planned.

Exhaust air heat pumps may be cheaper to purchase, but the house will probably be significantly more expensive because you already need extreme energy efficiency in the building envelope (insulation, windows, etc.) for the heat pump to work properly. With geothermal energy, an average house is sufficient. Since the heating costs with geothermal energy are already so low (e.g., our house with 300sqm of heated area + hot water for 5 people = €50 per month), there is hardly any room left to save. Oh yes, we formally meet Kfw 70 standards. If you want to build to Kfw 40 or better anyway, then take the exhaust air heat pump and spend the money saved on the house – you will need it.