Compatibility? - any help would be greatly appreciated

[Capsfan66]

Current setup: 

Single-zoned HVAC system 

No heat pump

G - green wire

RC - red wire

RH - has a gray wire that runs from RH to RC 

Y/0 - yellow wire

W/B - white wire

Blue wire not connected to a terminal, I'm assuming that could go to C terminal for powering the Nest? 

[Jeremyg]

Hi @Capsfan66!

Thanks for reaching out to the community. Regarding the compatibility on your system, there is no need to worry; help is here.

I am aware that you do not have a c wire attached. I need to know a few things about your thermostat in order to provide you with a better resolution.

• What Nest thermostat model do you have? For your reference, you can check out this article on how to tell which Nest thermostat you have.
• Is this the first installation?
• What is the make and model of your HVAC equipment? 

I'll be waiting for your response; any additional details you can provide will be helpful.

Best regards,

Jeremy.