If you are looking at mini-splits etc. you could use a 220VAC off of 110VAC via a transformer. We did that. When plugged into a 50A at and RV park we have our Aqua Hot on 110VAC 15A and our mini-splits running. The 15A isn't quite enough to heat everything but with the mini-splits it's fine so then our heating is quiet and not using any fuel. When dry camping then we use the burner on the Aqua Hot to keep everything warm. With our mini-splits on max for AC combined they draw 20A @ 110VAC and are really quiet. No noisy RV AC units that draw lots of power. I've never user the mini-splits just for heat since we like the floor to be warm. They don't seem to draw much.
It's kind of weird most are 220VAC when they don't need to be but probably are for world wide use.
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