So last fall I had installed a ductless heating system. I went with the LG model 24000 BTU and two heads, 1 for the basement and one for upstairs. I went with the system below. This system is rated for -26 C (-13 F) but under tests at my friends place his did not shut down until he hit -30 C and his an older untill then mine. The system can heat and cool, we haven't tried the cooling yet but will find out this summer. The heating worked as expected. We had no problems heating but the coldest it got here was about -25 C one or two nights. We primarily used it on days above -10 as there was no real point lighting a fire as well on the cold night if the fire went out I didn't bother to get up in the middle of the night.
How much did it cost to run. Well for me about the cost of a face cord. The warmer months Dec, March and April about 100 bucks for the month instead of having a fire, which normally I would have burned 1 face cord anyways.
https://www.ecomfort.com/LG-L2L24W12120000/p79057.html
https://www.ecomfort.com/LG-L2L24W12120000/p79057.html