so sorry for hijacking post this smart thromstat been cofusing me for weeks and op has same set up. so there no way to poer new thermo with set up wiring as it is
Hoping someone can help me iv done alot of searching around and this post closest to my own problem I'm trying to do same job as op using pretty much same thromoststs only difference is that my old thermostat only has 3 wires have included pics of my old and new