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If you have a background in electronics, there is an Arduino project to provide all the same controls as the Kumo Cloud accessory. It connects to the same CN105 connector and emulates the communication. Then you can interface to automation through Home Assistant. https://github.com/SwiCago/HeatPump. If I new about this a week ago, I would have opted for this route rather than spending the $550.
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I have four of these units. Not sure of your tech comfort level, but I didn't want to pay $200+ per unit for the Mitusbishi thermostat, so I got some ESP32s and programmed them with this library. Now they're fully controllable using my existing Hubitat setup and a driver I wrote.