Hi there!
Thanks for posting in the community and for the information provided.
Let me give you a hand to determine the compatibility of your HVAC system with a Google Nest Thermostat, I'd recommend using the Nest Compatibility Checker. This online tool allows you to input details about your system, such as the manufacturer, model, and thermostat wiring, to get a personalized assessment.
You can also take a look at the following article for further information:
Identify a thermostat wire: Checking your system's control board is a very reliable method for determining what an unknown wire is. The control board’s connectors typically have labels that can tell you what each wire is when other methods aren’t convenient or don’t work.
Please keep me posted if you need further assistance .
Regards,
Derick.
