My guess is that this is an operator issue. ie, someone not understanding the thermostat or a switch being off that needs to be on.

I have a Samsung SmartThings hub that manages the thermostat and the lock.

I just put a new roof on it, new HVAC, all new fixtures, new interior and exterior paint, new flooring, Nest thermostat, etc..

Mine can set door codes, message (or call) guests, schedule cleaners, adjust the thermostat, monitor my cameras, & call a plumber just as easily as a local PM can, for 1% of the costI wrote much more about leveraging offshore assistants in this post here.

Renovations included but weren't limited to: Point-up & sand walls, new paint, new floors in kitchen, new cabinets, new appliances, added washer and dryer, completely remodeled bathroom, bathroom door replace with a barn door, fixed pipes and installed portions of new piping in bathroom, recess lights added in living room, remodeled the back "patio" into living space (could be used for an office or den), steps in the back were fixed, new doors and locks throughout, new thermostat installed.. etc What was the outcome?

Renovations included but weren't limited to: Point-up & sand walls, new paint, new floors in kitchen, new cabinets, new appliances, added washer and dryer, completely remodeled bathroom, bathroom door replace with a barn door, fixed pipes and installed portions of new piping in bathroom, recess lights added in living room, remodeled the back "patio" into living space (could be used for an office or den), steps in the back were fixed, new doors and locks throughout, new thermostat installed.. etc What was the outcome?

For those of you looking for a smart thermostat, Amazon has the Emerson Sensi on sale for $83.17 w/free shipping for Prime members.There are a lot of thermostats out there, but what makes the Sensi nice is that it doesn't require a "C" wire if you have A/C and heat.

A typical ducted central air system where there is a single system for multiple units has other downsides: 1. landlord pays the electricity for the AC (nothing else is really fair to tenants); 2. single thermostat (unless multi-zoned somehow); 3. air isn’t isolated among the units - the return air goes back to air handler from all units together - so the air from a coronavirus infected person isolating at home potentially spreads to all units.

Over the weekend tenant continued to send landlord pictures of thermostat and notices of how hot it is in the unit.

I wouldn't turn it off,  but I would raise it up to say 80.I have honeywell 9000 wifi thermostats so I can remotely adjust temperature.