We have a Nest in which we turned off all smarts and scheduling, but it was still turning itself on and smoking us out of the house. We could not find any setting, any schedule, or anything that indicated why it was turning on. We ended up having to do a factory reset, and we never connected it back to the WiFi to get rid of these "smart" scheduling features. If anything, the Nest wastes money when using its smart features, as it's never on or off when it needs to be. The most stable room in the house is the basement controlled by a dumb, admittedly ugly thermostat.
The only nice thing about Nests is the overall look, but they're really poor devices. The OS on them constantly lags, causing dial inputs to suddenly "catch up". Each one of our Nests has its own personality: one lags, one turns on when it wants to (prior to factory reset, probably the third or fourth time we've had to do so), and the other one seems to actually just work.
This is the one I have. It came with my house that I bought so I didn't even pick it out so I'm not some shill. The app is kind of old and ugly but I honestly don't even care because it just works. https://www.homedepot.com/p/Honeywell-Home-Wi-Fi-Smart-Color...
The only nice thing about Nests is the overall look, but they're really poor devices. The OS on them constantly lags, causing dial inputs to suddenly "catch up". Each one of our Nests has its own personality: one lags, one turns on when it wants to (prior to factory reset, probably the third or fourth time we've had to do so), and the other one seems to actually just work.