New heat pump for old buildings without renovation

This week, air conditioning units are being installed for me: 7 indoor units in all bedrooms, kitchen, living room, and office, with 3 outdoor units – one single, one double, and one 4-split device. I actually wanted it for cooling in the summer since I have completely switched to underfloor heating (ceiling & wall), but afterwards I realized that I can also heat with it! I will do that too, putting my oil heating to summer operation, meaning only for hot water until the oil heating is removed and replaced by an air heat pump. Photovoltaics are also planned because of the electricity costs.

Why not simply use air/air instead of operating inefficient radiators with high flow temperature?

I would now assume effort. After all, radiators are already in every room...

How effective is an air-to-air solution supposed to be that already causes partly horrendous electricity costs even in new buildings? Regardless of the fact that a completely new heating infrastructure has to be built instead of simply replacing the heat generator (and ideally also the radiators).

How effective is an air/air solution supposed to be, which already causes partially horrendous electricity costs in new buildings? Regardless of the fact that a completely new heating infrastructure has to be built instead of simply renewing the heat generator (and ideally also the radiators).

I am currently experiencing that air/air via multi-split air conditioning is cheaper than my gas condensing boiler with underfloor heating.

Only for people who have money to spare and enjoy new technology. Even if the gas price settles at 15 cents/kWh and electricity drops to 30 cents and one should reach 3. I would be very surprised, with a flow temperature of 50°C and underfloor heating, an air-to-water heat pump can hardly achieve more. Unfortunately, physics cannot be tricked, not even by Panasonic.

The 20,000 EUR surcharge for a high-temperature heat pump must first be saved again. At a factor of 2 and the price mentioned above, this never happens. At a factor of 3, you pay 15 cents/kWh more for heat with gas... but for 20,000 EUR I can also buy 133,000 kWh more. By the time I have saved that, the high-temperature heat pump is broken...

Air-to-air heat pumps (split air conditioning units) in new buildings are certainly the future! No one needs a heat pump with an efficiency standard like EFH40. Split air conditioning units can also really cool in the summer. No more complicated hydraulics with pumps, buffers, etc., more space in the utility room, much cheaper and more comfortable (because you can also effectively run an ERR here). If I were to build new, I would only install air-to-air heat pumps in the house. I would do the hot water with instantaneous water heaters. If only these things weren’t always so ugly :p