| The first  step to installing a central air conditioning is to understand how the system  works. Air conditioning systems consist of three main parts: an outside unit,  an inside unit where the evaporator is located, and ducts or pipes which  distribute cold air or water to different rooms in a building.
 Start by  installing the air handler unit. It is usually installed in a basement or  attic. Follow the instructions that came with the unit. Make sure turn off the  main power to the house or building next! Continuing with the installation  while having the power on can be very dangerous! Install the compressor. It  should be placed on top of a base. The space surrounding the compressor should  be empty, so don't install it right next to a wall, plants or other items. It  should be placed on a stable and level surface. Turn the power back on. Check  to make sure that the unit is working.
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