So don't try to justify that you don't need the AC because renters seem to have a 15* black hole of temperature range that most people call normal.Check craigslist for technicians.

Also, they allow you to tailor the temperature of each "zone" individually. 

Or is your area fairly mild temperature wise all year round?

Typically an inspector would not test the A/C system if the ambient temperature is below 50 degrees which could be the case in Feb/Mar in Utah.

Even in my own house, I've had pipes start and stop leaking depending on the time of year (temperature causes expansion/contraction as I'm sure you know). 

The HVAC guy gave me a few options:1) Bare Bones $5000 - It will keep the place cool for roughly 8 years2) "Old Reliable" $7,500 - It cools, and is known for 15+ year life and a 10 year warranty3) Bells & Whistles $10,000 - High efficiency (we won't pay the electricity on this place), Variable speed comfort (it basically can adjust how much air it blows so that your house is at a constant temperature), can be connected with the "smart home" system so I can change the temperature or lock/unlock the door from my smartphone, have security cameras, connect the smoke detector etc.

my temperature gauge says yes, def cooling in east tennessee

Does anyone in this part of the country where the humidity and temperature is high, have these mini splits?

Your lease probably does not address a minimum temperature she should keep the house, but going forward you should.

Insulating pipes is rarely going to prevent frozen pipes when temperatures get very low; a source if heat is the only real solution when temperatures get low like when the “polar vortex” occurs.