My point was that there is nothing magical about mini split systems. The same technology can be, and is being applied to window air conditioners with similar results; and has been used on central air conditioners for a long time, albeit at much higher cost.
I’ve seen reports that inverter technology may be used on RV rooftop air conditioners. The biggest issue is that RV A/Cs are used so few hours annually that energy savings don’t justify the added investment. You would need/want the inverter technology for reasons other than energy savings.
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