I don’t think this post was mainly about zones. I think he wants info on inspecting heat pumps. Still some good zone info though.
Do you guys only test heat pumps on only a/c or heat? Like the ITA article states? They said one mode is enough.
From my point of view one mode is not enough. I have to get out of my HVAC tech mode. A heat pump in A/C mode may work just fine but switch to heat mode and not function well at all. Defrost controls not functioning, stuck reversing valve etc. Wearing an inspector’s hat you would not check these things. You would have to say due to ambient temperatures I was not able to check (heat or cool) and leave it at that.
Yeah, I’d like a checklist too.