

I was under the impression that some smart thermostats need batteries because the “power to the thermostat” wire was designed for super low power devices, or is otherwise not there at all (thus the different number of wires). So “already wired with everything you need” varies from house to house.




That makes sense. I have no idea if I have a ground. If I don’t I assume I need a battery powered thermostat, which I would then need to periodically change batteries on or externally power?
The fact that I don’t know what I have, means I dont know what I need, means I need to bring an electrician or someone who knows what is going on, and suddenly the project becomes more work.
I could totally handle the “build a HA dashboard” part of things… it’s the physically setting up devices part that gets me every time.