Also, an Air conditioner will work more efficiently if there is less moisture in the air (Houston, Florida, Alabama, etc).  

This apartment building has 12 units and has some very old central air conditioners that will all likely need replacing at some point.  

If you have an air conditioner in Arizona blow up  in the summertime (like I have), you need to have a Plan B, C and probably D.  ;-)Warranty Companies 'Suck':  Yup, some do.  

For example, one apartment upon inspection had an air conditioner set at 60 degrees and on the max level when only their dog was home. 

I don't know if your property has a fireplace, but to add to @Michael Greenberg's set of rules, which is very similar to our set of rules, we add "we ask that you please do not run the fireplace and the air conditioner at the same time" Because that costs us approximately 1 million dollars in electric bills.We have the same checkout procedure: strip the beds and put sheets/towels by the laundry, run the dishwasher, take the trash to the outside can.

The blower of the unit, both operating as a heater and as an air-conditioner, sucks up air from the returns and expels it through floor registers.

the air conditioner, or the home?

Lets be honest about what happens to cash flow of a couple of hundred of dollars a month when you have to replace an air conditioner for a couple of thousand dollars.Rent per square foot in Honolulu $4.36, Vegas per sf $.78.

Clogged Drain Plumber Plumber Furnace / Air Conditioner LocksmithElectrician

I considered buying one in a nearby area a few years ago for my first home, but quickly learned there are a lot of additional costs for things that would already come with an existing home, such as air conditioner, blinds, etc.