Thermostat configuraton

[chrislloyd915]

Hello.  i cant find a conversation about my existing configuration and need some help before i purchase.  I ran the compatibility checker, but it also doesnt match my config.  

i have 1 thermostat upstairs and another one downstairs.  I have a dual zone system (with dampers) and a whole home humidifier.

the upstairs has the humidifier settings - otherwise its a normal programmable thermostat.  the one downstairs just has the programmable features.  

when i ran the compatibility checker on the downstairs, i have W2, RC jumpered to R, O/B, Y and G - All seems good.  However, when i checked the main, it only has 3 wires - labeled 1, 2 and 3.   1 is red, 2 is white, 3 is blue.

My downstairs thermostat isnt always working (screen goes blank) so id like to replace the system with a smart one.  I got a $1000 quote for an HVAC system to replace the thermostats with smart ones.  im completely capable of installing, but am not sure the Nest will support this configuration.    any advice?

[Markjosephp]

Hello chrislloyd915,

It sounds like you have a complex HVAC setup with a dual-zone system and a whole home humidifier. I understand your concern about compatibility with Nest Thermostats, especially given the unique wiring in your downstairs thermostat.

For the downstairs thermostat, it seems like you have a standard setup with W2, RC jumpered to R, O/B, Y, and G, which should work well with Nest Thermostats. However, the main thermostat, with only three wires labeled 1, 2, and 3, might pose a challenge. To address this, you may need to identify what each wire corresponds to. Typically, R (red) is power, W (white) is heating, and G (green) is the fan. If you can determine the functions of each wire, it will be easier to assess compatibility.

If you're unsure, I suggest consulting with a professional HVAC technician. They can provide guidance on how to integrate Nest Thermostats into your specific system.

Let us know if you have more questions.

Best regards,
Mark