Nest Thermostat
A Nest thermostat is an upcharge by any AC vendor, but also it's wifi controlled and not something we want in a rental that has vacancy (therefore no wifi - it will stop working during vacancy and cost the owner more money).
If a thermostat that was in place is not working, it should be replaced by a base model type such as a Honeywell thermostat, etc... A battery operated basic grade thermostat that doesn't rely on wifi is the type that needs to be installed when an existing thermostat is in need of replacement.