For exact reason I want heat pump (i mean these ones with 60C temperature output), but my range starts from -5C (23F), where efficiency starts to drop. As for connecting to house heating system with furnace using mini-split is just few pipes and one or two valve away. Is not hard to have big note, reminding following: "light furnace - close valve a, use heat-pump open valve a and close valve b"Main problem is price... The air-water heat pump which looks match my house something from 4000-4500€ and I living in small house. Yes there is government assistance, but main requirement is to remove (to wall up) chimney and remove burning stove... which during cold winter will rake costs to insane numbers.
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