Here are the various problems: others have mentioned the ability to control the temperature and access the electrical panel 24/7 (those items just make sense).

That can largely be avoided by planning ahead to keep it separate as possible,  and submeter or mitigate in other ways when not possible;  like apparently these days you can get programmable thermostats with a 'administrator' mode that will allow you to set a maximum temperature in case you end up sharing with a resident who likes to keep the house at 80 degrees with electric baseboard heat.   

This is something we would provide to our clients.CO and fire detectors that also send notifications to the property manager.Smart thermostat - This allows the property manager to control the temperature settings when the property is unoccupied.

There might be 30 degree temperature swings over the course of a day.  

They assumed a family of 4 in the local area where incoming water temperatures varied significantly by season.  

Anyone every implement a household practices contract... for example quite hours after 10pm - 6am, designated parking spots, house temperature has been a big one in my house hack (some complain about it being to cold when the thermostat is at 70).

I just installed a second thermostat and damper system into a SFH we were flipping in Plymouth and it has drastically reduced the variance of temperatures between the first and second floors.