Thermostat wiring

[Larry23]

Hey all,  my HVAC has been running with a competitors smart thermostat for the last 12 years and now they have changed their format on the website and I am no longer able to use it with out paying for subscription . My wife bought me a new nest thermostat and I am not sure about the wiring. I have 4 wires coming from the wall that according to my manual for the old thermostat are  blue 12v, yellow GND,  red D-, white D+.

The Ds are Data communication lines.

So can this not work with the nest product?

Thanks

[EdmondB]

Hello Larry23, 

Thanks for posting here in the Community. Based on the label of the wires from your current thermostat, your system is a Proprietary. This is not compatible with any type Nest Thermostat.

Check out this link for Nest thermostat compatibility. Let me know if you have more questions.

Thanks,
Edmond