Just fyi, I'm looking for a HomeKit solution to control my Window AC only. Tado has something, but it's far too expensive for what it does and has bad reviews. What I'd be looking for in HomeKit support would be:
1) temperature & humidity notification
2) Window AC control via IR blaster
That's really about it. Geo-location would be a plus for other potential customers, but not necessary for me since I have animals at home. Also, if it can do custom IR programming, so I can sneakily turn on and off the TV/stereo system and possibly adjust the "temperature" to change volume via Homekit, I'd be ecstatic.
I would suspect that an affordable decent window AC controller by itself would have a pretty good market, considering that in many cities, such as Manhattan/Brooklyn/Chicago, it's fairly common to only have window AC and radiator heat.