Our AC is already running a good bit in the day as temperatures are getting up to 80.We just put in a wifi smart water heater in our Vrbo.

Scary looking guys with neck tats that weld and do ironwork. 

Mold needs moisture, the right temperature and food to grow.

Thank goodness here in Georgia we don't have the freezing temperatures you have.

You can also add wifi lights and thermostat, allowing you to control the lights and temperature at a distance.Only allow them to enter the premises in your absence after they email you a photo of their driver's license and if it is more than one person, get photos of all of their driver's licenses.

Upstairs tenants currently have no way to regulate the temperature of their unit, and this is Minnesota where we get to -20 degrees in the winter...

Now, down at those temperatures, your COP will be approaching 1.Here where we have cold winters, code requires an ancillary heat source - electric baseboard heaters are most commonly used - to supplement the heat pump in the dead of winter (we frequently get 2-3 weeks where temperatures are below -20C).In a warmer climates, even if code requires you to put in ancillary heat, you should never have to use it.

@Yuvaraj Vimawala I own a lot of duplexes and some SFH in Dallas and here is my advice:I send a repair person within 24 hours if the temperature is more than 80C.

However the inspector took pictures showing temperatures and showed that the AC worked, but later documented that it didn't work. 

They also keep food out at room temperature and think nothing of it .