Swapping 3rd Gen Nest to 4th Gen

[Meowmixpete577]

I have a 3rd Gen Nest already installed in my house. I just bought the new 4th Gen Nest that got announced a couple of weeks ago. 

Will I be able to simply swap the thermostats? Will the 4th Gen Nest fit on the 3rd Gen Nest base plate?

[Patrick_Caezza · Accepted solution]

@Meowmixpete577 

Yes, you can replace the 3rd Gen with the new 4th Gen but you have to replace everything.

[Meowmixpete577]

@Patrick_Caezza 

So the baseplate where the wires go for the 3rd Gen isn't usable for the 4th Gen? 

I was hoping I could just pop off the old Nest and pop in the new Nest in 5 seconds. 

[Patrick_Caezza]

@Meowmixpete577 

Correct. The 4th Gen has 12 terminals and the 3rd Gen only has 10.

[donaldscanlon]

I currently am too going to upgrade my 3rd Gen with the 4th Gen that arrived yesterday and was wondering should I delete the 3rd Gen from the Home App first before starting setup of the 4th Gen? 

[donaldscanlon]

@Patrick_Caezza   I currently am too going to upgrade my 3rd Gen with the 4th Gen that arrived yesterday and was wondering should I delete the 3rd Gen from the Home App first before starting setup of the 4th Gen? 

[Nexusis]

Hooked up mine today and as mentioned above, I had to change everything. The new baseplate has a few more options. However, it didn’t take too long and was quite straight forward. 

[donaldscanlon]

Did you delete the old 3rd gen thermostat from your Google Home app first before beginning the install of the 4th gen?  I plan on doing mine tonight.  

[Nexusis]

yes i removed the old one so it doesn't conflict with the new one. 

[steverino]

Did you lose all the heating and cooling data you had that was associated with your old one?

[donaldscanlon]

Yes.  All gone when you delete the old thermostat 

[steverino]

Just helped make my decision to not upgrade and saved me $380 (was also going to upgrade all my sensors).  Thank you!

[Davedotson284]

No