So much thanks to everyone here. For my purposes this is SOLVED.
MY STEPS TO SUCCESS:
- Purchased 1 Sensibo Air
- Waited for it to arrive…twiddled my thumbs
- Set it up using the Sensibo Mobile App, the process was easy and well designed. Took 5 mins not including a firmware update that happened.
- Followed HA Help Docs to acquire the API key.
- Followed @cowboysdude instructions (fix the indents after pasting into HA file editor)
- Restart HA.
- Success. The widget fully controls my Mr. Cool DIY unit! Updates within 1 second.
I havent gotten as far as building it into automations and scripts, but wanted to report my success (and delight). Thanks to all who got us this far!