With no direct experience, just quotes from vendors, I have the impression that as temperature drops, so does efficiency of the mini-splits. However, that says to me that they don't fail to heat, it just costs more to run them. If the temp drops to 0 F I pay more for oil and the electricity to pump the hot water or hot air around the house. Presumably, I pay more for the mini splits to operate as well, but I can turn down the heat in lesser used rooms and balance things out. Yes ? No?
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