And, MassSave mentioned that there are models that suck in the ambient air and dehumidify, are these worthwhile?

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.

All-electric house = cost us nothing.By the same token - you and your tenants should be aware:  A/Cs can only cool so far relative to the ambient temperature. 

Derek your neighbors can hear and feel your "thud thud thud rumble rumble" on top of their own music and through their earplugs and over and above an other ambient noise.

No matter the fan you will have some ambient noise.

If it's ambient air, consider providing a dehumidifier or a/c.  

So I dress & head over to discover she had our maintenance guy on the lower roof trying to remove the melting snow & ice.The ambient thaw had started & the elderly lady decided to open the window several hours earlier.....she doesn't pay for heat..YET!!!

The biggest risk you actually run is not the failure of appreciation beyond the ambient inflation rate but the fact of depreciation such that you fall below it.   

I have to agree with the above regarding sealing the crawl space due to high humidity in ambient air.

Personally, I just communicate with my tenants that we keep the HVAC (in florida so rarely need the furnace) above 68 degrees at all times, and that it is best to keep the HVAC above 74 degrees during the hotter afternoons where the ambient temp is in the 90s.