Smart / WiFi Thermostat for Rental?

[David Santore]

I am getting ready to rent my duplex in an owner/occupy situation, and I'd like to put in a smart thermostat for my rental unit.  Two reasons - amenity appeal, and control if the unit is vacant (tenants on vacation and there is an issue, or between tenants and need to maintain temp).

What smart thermostats have worked for others owner/occupiers?

My question is - would I need to connect the thermostat to my wifi, and just give general access to my tenants - changing the password to it when they leave?