I went with a multi-split central AC: despite the higher cost, it is generally a usability mess. You can only run one mode for all rooms, and while that sounds

I went with a multi-split central AC: despite the higher cost, it is generally a usability mess. You can only run one mode for all rooms, and while that sounds reasonable, I have one tiny storage room that houses my old dual Xeon heater, which requires AC on even in the winter.