Some links to get the ideas started..
https://github.com/ToniA/arduino-heatpumpir
https://www.openhardware.io/view/41/Heatpump-airconditioner-controller
My heatpump:
Electronics and other complex systems of interest to Chester Lowrey
Some links to get the ideas started..
https://github.com/ToniA/arduino-heatpumpir
https://www.openhardware.io/view/41/Heatpump-airconditioner-controller
My heatpump: