I posted this as a reply to a reply in another thread and realized I probably should make this a separate thread.
My present furnace / thermostat / transformer arrangement consists two wires: Rh and W. Since this apparently isn’t supported, I assume I need to install a 3rd wire and re-configure the wiring as follows. Can someone validate this approach for me, or correct it if I am wrong?
24 VAC xformer lead 1 of 2: to Wyse “C” and to furnace lead 1 of 2
24 VAC xformer lead 2 of 2: to Wysie “RH”
Wyze W1: to furnace lead 2 of 2