Just to close the loop, received the Sensibo devices today. Absolutely awesome. They work beautifully. I've now got 3 air conditioners IoT'd up and working nicely using IFTTT to receive a trigger phrase from Google Home, kicks of a Stringify flow to turn on lights etc, then back to IFTTT to activate the air con using the Sensibo device. It works great. Recommended!
Now it would be great to get a direct interface with Stringify please!