You have 2 stages of Heat and 2 stages of cooling so you need the Nest Learning Thermostat.
Or if you dont care about the 2 stages you could put the 2 W in the same W terminal and the 2 Y in the Y terminal.
If you do this way you do not have the switching from low stage to high stage anymore it will run full power cooling and full power heating.
It is less efficient and runs full power heating and cooling when it kicks on.
The stages are designed to run at lower power in mild conditions when you don't need 2nd stage and if it senses the house is too hot or cold it brings on the 2nd stage.
Its supposed to be more comfortable with 2 stages.
Only the Nest Learning model has the extra terminals to do 2 stages of both heat and cooling.
No Addtional Questions Thank You, just no thrilled about returning my New Nest and buying another Nest Learning thermostat. the last Nest Learning thermostat I had wifi failed on it after only 2 years with Zero support from Nest.
Thanks for the update. I'm sorry to hear about your experience. Don't hesitate to reach out to us whenever you need assistance. I will be locking this thread in 24 hours. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.