Compatibility of my current thermostat to nest thermostat

[DrProfessor]

Just wondering if my new home thermostat (Trane system) is compatible to the nest learning thermostat? (photo of my current wiring is included). 

[leahcameron286 · Accepted solution]

To check if your thermostat is compatible with a Nest Thermostat:

1. Check the Wires – Remove the thermostat cover and look for R, Rc, Rh, W, W1, W2, Y, Y1, Y2, G, C, O, B labels. If you see thick wires or 120V/240V labels, Nest won’t work.
2. Use Google’s Compatibility Tool
3. Common Issues – Missing C-wire, heat pump systems, or proprietary wiring may need extra setup.
4. Model Differences – Nest Learning Thermostat supports more systems than the Nest Thermostat (2020).

[Patrick_Caezza · Accepted solution]

@DrProfessor 

Yes, your system is compatible.

Give this wiring a try.

White - W1 to W2 (set as AUX heat)

Green - G to G

Yellow - Y1 to Y1

Orange - O to OB

Blue - B/C to C

Red - RH to Rc (jumper to RC not needed)

[leahcameron286 · Accepted solution]

To check if your thermostat is compatible with a Nest Thermostat:

1. Check the Wires – Remove the thermostat cover and look for R, Rc, Rh, W, W1, W2, Y, Y1, Y2, G, C, O, B labels. If you see thick wires or 120V/240V labels, Nest won’t work.
2. Use Google’s Compatibility Tool
3. Common Issues – Missing C-wire, heat pump systems, or proprietary wiring may need extra setup.
4. Model Differences – Nest Learning Thermostat supports more systems than the Nest Thermostat (2020).

[Patrick_Caezza · Accepted solution]

@DrProfessor 

Yes, your system is compatible.

Give this wiring a try.

White - W1 to W2 (set as AUX heat)

Green - G to G

Yellow - Y1 to Y1

Orange - O to OB

Blue - B/C to C

Red - RH to Rc (jumper to RC not needed)

[DrProfessor · Accepted solution]

@Patrick_Caezza Thank you.  It works.