The key is to make sure you get the most efficient mini splits. 2 years ago I got the cheapest Mitsubishi that also did heat (because I didn't want to spend the extra 1k for the more efficient model). I have been happy with it but I do wish I went with the more efficient one. My electric usage went down in the summer vs the old window ac units. For heat I run them until December 31st then use my oil furnace until March. I average about 900 kwh in November and December. Last month I used 598 kwh. I also have solar! I think a great setup would be a well insulated home, solar, battery backup and efficient mini splits.