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  Air conditioning works on the principle of heat transfer whereas heat is drawn to a cooler areas and surfaces.

  A system, before it starts, has an equal amount of freon pressure throughout the system. When it starts the
compressor draws down the pressure in the evaporator coil causing the corresponding temperature of that coil
to lower. The indoor blower will turn on, and draw the warmer air in your occupied space across the cooler evaporative coil which will absorb the heat via the freon. This heats will be drawn into the compressor and compressed to a higher temperature as it is pumped outside to the condenser coil.  Because the condenser coil, with the heat that has been removed from your home, is now hotter than the ambient air outside it can now be transferred by the outdoor fan into the atmosphere.

  So you see, in reality, air conditioning is heat removal.

   A heat pump works the same way as an air conditioner in summer, but in winter the flow is reversed and removes what
available heat there is outdoors and discharges it indoors to heat your home. 

   Because of the colder air outside, your heat pump will accumulate ice on the outdoor coil. To remedy this it will shift into cooling and turn off the outdoor fan motor to melt the ice. You may notice cool air blowing from the vents and steam rising from your unit when this occi=urs and it is natural.

 The most important thing a homeowner can do for their system is change the air filter. There is no 3 month filter in arizona-systems run more here and they must be checked and likely changed every 30 days. Tile floors will cause your filter to get dirtier more often.

   You can set your thermostat at virtually any temperature, but keep in mind, the lower you set it the more you will pay in electricity. Find a comfortable and affordable setting and leave it alone as much as possible.  You cannot generally set it down into the 60's without causing the evaporator coil to freeze, and setting it 90 or above for extended periods of time can cause problems for cloth and wood in your house.

  You can set your thermostat at virtually any temperature, but keep in mind, the lower you set it the more you will pay in electricity.
Find a comfortable and affordable setting and leave it alone as much as possible.  You cannot generally set it down into the 60's without causing the evaporator coil to freeze, and setting it 90 or above for extended periods of time can cause problems for cloth and wood in your house.

  After turning off the power to your unit at the breaker panel, it is helpfull to occasionally spray down your outdoor coil with a low pressure setting on your garden hose.

  The air coming out of your registers should be 18-22 degrees cooler than the air entering your return grill.