I mean turning it off and locking it so that no one can adjust the temperature. As it is right now, you can only lock it to a certain temperature range, but not lock it completely. Correct?
You keep changing the question!
You can turn it off AND THEN ‘lock’ it, of course. The answer to THIS is that you can lock the Nest so that it is not adjustable by anyone who does not have a PIN code. Last help message, my friend - this is (like all others) copied directly from the Nest instruction pages:
“You can lock your Nest Thermostat from the Settings menu on your thermostat, or with the Nest app. Locking your Nest Thermostat is a good way to keep guests or children from changing your thermostat’s settings while still letting you and your family adjust your home’s temperature within the range you’ve set.”
This sounds like a classic case of RTFM.
JF