I had two mold remediation companies come and look at it and they both said it is due to the temperature variance in the winter from the craw space to the bedroom. 

In other words, guests will only be able to control the AC between your locked min/max temperatures, but they would not be able to change to heat mode.

NEC Article 394.12 (5) Uses Not PermittedHollow spaces of walls, ceilings, and attics where such spaces are insulated by loose, rolled, or foamed-in-place insulating materials that envelopes the conductors.Blown-in, foam-in or rolled insulation prevents the dissipation of heat into the free air space, resulting in higher conductor temperature, which can cause insulation breakdown and possible fire in the insulation.

Will use that to check the temperature. 

I never want to be the one to dissuade anyone from pursuing their dreams, but Phoenix is as hot a market as it is temperature in the summers. 

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).