Help with connecting wires on thermostat

[Lherring]

Have an extra wire on old thermostat with E. Can’t figure out what to do with it. 

[CoolingWizard]

Can post the picture you took of the old thermostat?  normally the E is for Emergency Heat when you have a heat pump system.  Only the Nest Leaning Thermostat can support both Auxiliary and Emergency heating control. 

AC Cooling Wizard

[Markjosephp]

Hello folks,

I wanted to stop by and see how I could help.

Thanks for asking for more information, @CoolingWizard.

@Lherring, to better check your wiring configuration, you can share with us a photo of your existing thermostat's wiring. This will help us decide how it should be labeled. Also, please take a look at this article and let us know if you need more help.

Regards,
Mark

[Jake]

Hey Lherring,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Markjosephp]

Hi Lherring,

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or concerns before we lock this thread in 24 hours. 

Thanks,

Mark