Nest thermostat install

[Home_fsd]

Hi,

Need help for wiring of nest thermostat. I have proprietary ABCD communication system for my heatpump. Can it be switched to legacy RGYB. 

[zoeuvre]

Hi Home_fsd, 

Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. Proprietary systems aren’t compatible with Google Nest Thermostats. However, some proprietary systems can be rewired by a pro installer to be compatible.

Let us know if you have any other questions. We're happy to help. 

Best,

Zoe