He's been renting from the same landlord for 5 years, and he made a joke about filing suit against me if his kids get scalded with hot water while signing the section of the lease where he verifies the water heater temperature. 

Make sure showers are getting enough hot water and the temperature doesnt fluctuate. 

please set the gauge to your desired temperature ".

Depending on the temperature, A/C IS considered an emergency here in Florida.

I keep the AC at 76 during the day I believe, and around 72 overnight.2) Some of the newer smart thermostats (e.g. the Nest) have the ability to set a pin that is required to adjust the temperature.

@Bret Weigel some people will leave the temperature high during the day, then get home and crank it down 10 degrees and expect it to be instantly cool.

Did they change the temperature, so it needs to kick on?

What is the temperature differential between the cold air return, and the vents?

The vast majority of homes here are built without A/C both because energy is much more expensive here and because temperatures rarely get above 80 degrees.

There is a temperature setting on the burnerTURN IT WAY LOWER!