I know it's not necessary since the main unit works fine and the temps are not near high enough to justify it. 

Not really all that uncommon of an occurrence, if a tenant cooks at high temps excessively, has buildup of grease on coils and/or has clean, but cracked, coils.

At this point, I also learned that some cartridges in bath/shower fixtures are designed to keep the temp at safe levels to prevent scalding.

This is only temp.

Hello all,I'm in need your advice on how to handle the situation i am currently in.A year ago we purchased a second home in FL and rented it out right away. To be honest, we were thinking of at least partially spendin...

To top it off, the utilities are connected, so there is only 1 thermostat (in the main house), but the back house has window units and space heaters to regulate temp if needed (the front house is on a schedule and I have a Nest thermostat there that I can control if needed).  

If any tenant is not using the air conditioner or heater during temps that are below 32 or above 80 degrees - they will be sent a demand notice to use them immediately or be subject to eviction.

Meanwhile, I monitored the temp of the old fridge with a thermometer for 3 days, and it was always at 4C .

Great idea @Pat L. regarding running subs through a temp agency.

Hey @Asher Coleman, have you called the local hospitals to see if they are hiring temp nurses that need housing?