Automate Ducted Evaporative Aircon

Hi all.

I’m looking to automate an evaporative aircon and I’m not sure where to start, the control panel is stupid simple, fan on/off, water pump on/off and then the fan speed.

I will attach a pic of it.

Im in Aus so if anyone has some insight on what I can do that doesn’t break the law that would be good too.

Any ideas? IMG_20180221_233340

Edit: I have a xiaomi temperature sensor that will help me turn this thing on and off.