If you’re thinking about a mini split heat pump for a smaller space, 110V/115V...

https://smoothdecorator.com/is-it-normal-that-110v-mini-splits-cost-more-than-window-ac-units/

If you’re thinking about a mini split heat pump for a smaller space, 110V/115V models with 9k-12k BTU are a solid fit. They run off a standard 15A dedicated circuit and often deliver efficient heating down to -13°F