My first post here, so excuse any mistakes! I operate my main lounge aircon here in Thailand via Smartthings and Google. 'Hey Google, Aircon ON'. Simple On/Off installation on a three phase 13. 5kW aircon unit. 3x220V. Cost of installation about 37USD. Conventional Z-Wave power plug unit (23$) is wired to activate an electro-magnetic switch. (Fuji FC-O unit. see pic. 14$). The EM switch is wired in the power lines to the Aircon unit after the main isolator in the utility cabinet. EM switch can easily handle the three phases. Switch the aircon on with the remote and leave it ON. Activate the EM switch via the Power Plug unit . and presto Aircon ON/Aircon OFF. I can post more pics if above explanation is insufficient.