https://www.googlenestcommunity.com/t5/Nest-Thermostats/nest-thermostat/m-p/568173#M113078 <P>Hello just2,&nbsp;<BR /><BR />Thanks for posting here in the Community. Based on the terminal of the wires from your current thermostat, this is a proprietary system. This is not compatible with any type of Nest Thermostat.&nbsp;However, some proprietary systems can be&nbsp;<A href="https://goo.gle/2KfNYjV" target="_blank">rewired by a pro installer</A> to be compatible.&nbsp;Check out this link for&nbsp;<A href="https://goo.gle/47KDcLL" target="_blank">Nest thermostat compatibility</A>.<BR />&nbsp;</P> <P>Let me know if you have additional questions.<BR />&nbsp;</P> <P>Best,<BR />Edmond</P> Mon, 25 Dec 2023 06:16:56 GMT EdmondB 2023-12-25T06:16:56Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/nest-thermostat/m-p/566827#M112885 <P>have wires bk and b/c on old therm. where do they go on new them.</P><P>&nbsp;</P> Thu, 21 Dec 2023 21:01:45 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/nest-thermostat/m-p/566827#M112885 just2 2023-12-21T21:01:45Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/nest-thermostat/m-p/568173#M113078 <P>Hello just2,&nbsp;<BR /><BR />Thanks for posting here in the Community. Based on the terminal of the wires from your current thermostat, this is a proprietary system. This is not compatible with any type of Nest Thermostat.&nbsp;However, some proprietary systems can be&nbsp;<A href="https://goo.gle/2KfNYjV" target="_blank">rewired by a pro installer</A> to be compatible.&nbsp;Check out this link for&nbsp;<A href="https://goo.gle/47KDcLL" target="_blank">Nest thermostat compatibility</A>.<BR />&nbsp;</P> <P>Let me know if you have additional questions.<BR />&nbsp;</P> <P>Best,<BR />Edmond</P> Mon, 25 Dec 2023 06:16:56 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/nest-thermostat/m-p/568173#M113078 EdmondB 2023-12-25T06:16:56Z