Google Nest Community

When I wanted to replace my old thermostat with a nest learning thermostat, there are two wires from the wall connected to my old honeywell thermostat on the W and B terminals. There is a jumper from R to RC. How should I connect these two wires to t...

I have an old Honeywell thermostat. I think the model is TH4110B but I am not 100% sure. I only have 2 wires W and B connected from the wall and a jumper with R and RC. I wonder why I don.t have a R wires from the wall since I want to replace it with...

HiMy old thermostat is Totaline P286-1600 which have only 2 wires but control for both heating and cooling systems. The two wires labeled Y2 (a bit yellow) and RH (black). How to I connect to my new Nest Learning Thermostat?