Phone control of thermostats

[Redd1]

I have two a/c units and two nest thermostats. I have the nest app installed on my iPhone but I can’t get the phone to control nest

[David_K]

To confirm, what model of thermostats do you have?
How to tell which Nest thermostat you have - Google Nest Help

Is your phone connected to the same Wi-Fi network as the thermostats? Can you see them in the app?