The feature support page shows Bluetooth as working in the M2 Airs. Is there a particular feature or compatibility issue that you’re waiting on?

Do you need to control the temperature remotely, or just switch it on? If the latter, could you just leave the existing potentiometer / power switch always in the on position and add a new zigbee relay to cut power to the whole works on & off?

Why buy new, when you can just trade it in for a new model in a few millennia? You know a solar system loses 20% of its initial value just by driving it off the lot?

This personal inventory project hasn’t been updated in a couple years, but looks Ike it could work for what you’re describing.

There’s a “docs team” that hangs out on the NixOS discourse that I’m sure would be happy to have you. They have meeting every couple weeks if you want to say hi & find out what would be a good way to start contributing.