ᐅ Building a House with an Architect – Which Heating System?

We plan to build next year. The plot has been purchased, and we are currently working with a friend who is an architect on our house. Now the question is how to heat it. Gas is not available at our new location. So we are considering geothermal heating :-)

Here’s my problem – my wife wants it to be warm, around 23-24°C (73-75°F), especially in winter, she can’t stand it colder than that. Do geothermal heating systems manage to maintain that temperature in a house? If yes, are the electricity costs still affordable?

Thank you very much for your answers.

Of course, it is possible, and with proper planning, it does not cost more than using gas—actually, usually less.

The insulation of the house does the rest 😉

If it’s still relevant – I have a small photovoltaic system (2011) with 4.5 kW on my current house. I still receive 16.74 cents per kWh for self-consumption (current self-consumption is about 45%).

Of course, it's possible (and affordable too).
We (house approx. KFW 55 standard, 250 m² (2700 sq ft) living area – 300 m² (3200 sq ft) plot size, average temperature 22°C (72°F)) have now spent 11 months in the new house and have used less than 3,000 kWh of electricity so far – heating and hot water for five people.
You can calculate the cost yourself and consider it reasonable 😉
The fireplace in the house was used at most 15 evenings and didn’t really serve any heating purpose.

What size is your hot water storage tank, and what is the capacity of the heat pump?

@Lexmaul79: We have a domestic hot water storage tank with 500 liters (132 gallons) capacity as well as a Waterkotte Eco Touch Ai DS 5014.5 with 10.3 kW heating output.
The overall COP is around 4.6/4.7 – not bad.