Efficiency drops as the source of thermal energy gets cooler, but generally a residential heat pump uses between a third and a quarter of the electricity you'd need to create the same heat with electric heaters.
It used to be that you needed ground or water sources, but the new air-source ones are supposedly able to work nearly as well, and are far cheaper to install.
Heat pumps do have a compressor that uses a lot of power to start up; North American houses usually would need an electrician to install a 230-240V circuit in addition to the usual 110-120V. I don't know enough about standard wiring in Germany to know if you'd need to upgrade.
If you live in a rural area with abundant wood, and your municipality allows burning wood for heat, it might be cheaper to increase the heat output of your wood stove. My uncle uses one of these thermoelectric fans - no wiring needed, it just sits on the stove and uses the heat of the stove to circulate the heat.
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It used to be that you needed ground or water sources, but the new air-source ones are supposedly able to work nearly as well, and are far cheaper to install.
Heat pumps do have a compressor that uses a lot of power to start up; North American houses usually would need an electrician to install a 230-240V circuit in addition to the usual 110-120V. I don't know enough about standard wiring in Germany to know if you'd need to upgrade.
If you live in a rural area with abundant wood, and your municipality allows burning wood for heat, it might be cheaper to increase the heat output of your wood stove. My uncle uses one of these thermoelectric fans - no wiring needed, it just sits on the stove and uses the heat of the stove to circulate the heat.
https://www.leevalley.com/en-ca/shop/home/fireplace/woodstove/50246-ecofan?item=45K1870