ᐅ Renovation of a Residential House Including a New Heating System – Any Experiences?

Hello,

I am planning to renovate my residential building and would like to ask the experts for advice:
Current situation: Residential building (basement, ground floor, upper floor) with pellet heating system, upper floor thermally insulated.
Here are some considerations regarding a new heating system design:
Deep geothermal drilling with brine heat pump, photovoltaic system, battery (energy self-sufficiency), surface cooling.
No split air conditioning for health reasons!
Since I am concerned that the brine heat pump might not provide enough power in very cold weather,
I want to use the existing pellet heating system as a backup or peak load coverage.
Is it possible to combine these systems?
What is your opinion? What could be improved with these (non-expert) considerations? Is this approach even reasonable?

Thank you very much for your help!
Best regards

grivel99 schrieb:

Deep drilling with ground-source heat pump, photovoltaic system, battery (self-sufficiency), radiant cooling.

A battery does not lead to true self-sufficiency – in winter, when you need electricity but there is no sun, the battery doesn’t really help.
Why choose a ground-source heat pump with drilling? You generally don’t recoup the investment through slightly reduced heating costs.

grivel99 schrieb:

Since I am concerned that the ground-source heat pump might not provide enough output in very cold weather,

Ground-source water-to-water heat pumps are actually ideal for very cold weather. Air-to-water heat pumps become increasingly inefficient as the outside air gets colder. The ground delivers an almost constant temperature regardless of weather conditions.

grivel99 schrieb:

I want to use the existing pellet heating system as a backup or for peak load coverage.

That is possible, but a) it’s financially impractical and b) requires a complex heating system.

grivel99 schrieb:

What is your opinion? What could be improved in these (layperson) considerations? Is this approach even sensible?

Use a standard air-to-water heat pump and spend the tens of thousands of dollars saved on more practical things.

nordanney schrieb:


Use a standard air-to-water heat pump and invest the tens of thousands of euros saved in more useful things.

I would fully agree with that.

If the pellet heating system is old or due for replacement, then get rid of it. If it is rather new and the manual effort is acceptable to you, then keep it and add the heat pump. But having both together requires a skilled designer and installer – and an involved homeowner – for it to work. In reality, a heat pump alone is usually simpler.