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Wiring harness on Nest Thermostat.

dougadamsjr1125
Community Member

‎07-27-2025 06:44 AM

The wiring harness on my present thermostat has an "R" post. The Nest harness has both "RH" and RC". Which do I use?

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DeboraJ
Community Specialist
Community Specialist

‎07-30-2025 09:15 PM

Hi @dougadamsjr1125,

 

Thanks for reaching out to the community! I understand that you have some questions about the wiring for your Nest Thermostat, as it has a different wiring configuration than your old one. I can help you with this!

Before we move forward, could you share a few details:

  • What type of Nest thermostat do you have?
  • What is the make and model of your HVAC system?
  • Did you use the online compatibility widget before you purchased the device? If not, please refer to our "Compatibility Checker US" or "Compatibility checker EU."
  • If you did, what did the compatibility checker direct you to?
  • If not, did you use the setup flow in the Nest or Google Home app to check for your thermostat's compatibility?

Once you have that information, I'll be more than happy to provide assistance.

 

Best regards,

Debora

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