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Help to identify my System Wiring and compatibility with Nest?

Community Member

could someone please help identify my system and which Nest is required?

Trying to help sister install a Nest, but only fan with no cooling.   In research of wiring, I’m thinking her system may be a Heat pump with aux.   Therefore, may need a Nest Learning and not Nest.

much appreciate the help!



Community Specialist
Community Specialist

Hi Vin472, 


Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. Fortunately, your thermostat wires are compatible with our Nest Learning Thermostat 3rd generation and should be wired to the Nest Learning Thermostat as shown:



You disregard the jumper wire that is connected from the E terminal to the W2 terminal in your current thermostat, as that is no longer needed for the Nest Thermostat. Also, here's the guide for the installation and setup of a Nest Learning Thermostat 3rd generation.


Let us know if you have any other questions.We're happy to help.