I've done this too and sure it's not perfect. But it's better than the average person in my industry. So, 1, that means a decent chunk of my industry could use it and be about as good as they are now.

2, unless I magically have a plan for talking to an expert in HVAC repair, and not just an idiot in HVAC, I can diagnose my HVAC unit with AI just fine. And I did. And no it wasn't as simple as "well duh, every post online says it's the large capacitor".