I'm in Miami and I also have a smart Nest thermostat. I have it locked to cool from 70 to 78. However, this month a guess complaint of the house being to hot at 70. So I removed the lock on the thermostat and asked them to be reasonable. I ask them to make sure the unit must stop once in a while and not run it nonstop.
Well, the outside temperature was 75 and they set the unit at 66 and they kept it running for 14 hours a day. I reset the lock on the thermostat and it was worst than the first time. Within minutes they were demanding I remove the lock. This is the last time I do this. If a guess wants to go below 70, I feel they must pay an extra fee.
There is a risk of running an A/C nonstop. It can brake the unit and my unit costs $7,000.00.