A standard AC installation includes: examining duct wires and refrigerant lines, using a gravel base to level out an area for the new AC,removing existing indoor evaporator coils, mounting and installing indoor units on the wall, placing and installing outdoor units at reachable locations, setting new air conditioner condenser,drilling minimal holes for connections (the wall core is not cut in the process) and lastly the cleanup and closing to remove any drilling debris and equipment from the installation site. Some providers also perform a test run to check functionality and add a locking cap tothe outdoor unit to prevent theft of the refrigerant.