3 Wire Install Question

[zidagose]

I have a 3 wire thermostat (Honeywell) for heat and ac, no zones.  Colors are red, white, green.  On the honeywell, green can be plugged into either the G or C and it works either way (tested it).  I didnt take a picture before removing so of course I am now not sure which it was in to begin with (totally spaced out).

I read on the internet the G can be repurposed as the C.  Can anyone verify and will the Nest work or do I need the adapter thing?  Any way to check?

[RenzJ]

Hi zidagose,

Thanks for visiting the Google Nest Community. We'd be happy to take a look into this. Based on the color of the wire, the green wire should go to the G terminal on the Nest Thermostat, but we wanted to make sure that everything would run smoothly. Before we wire it. Please answer the following:

1. Are you from North America or Europe? 
2. What type of Nest Thermostat do you have? 
3. What is the make and model of your heating, ventilation, and air conditioning (HVAC) equipment?
4. Send a picture of your current HVAC board wiring.

I look forward to your response

Cheers,

Renz