Hi PDCO,
Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. Are you located in North America or Europe? And what is the make and model of your HVAC system? Send us a photo of your current thermostat wiring configuration so we can take a closer look. You may also use our Compatibility Checker to determine if a Nest thermostat is compatible with your heating and cooling system.
Keep us posted. We're happy to help.
Best,
Zoe
