A central air conditioner system is more than just the condensing unit – the outdoor unit usually referred to as the air conditioner.
If you sign a contract for a new air conditioning system, it will (at least should) include the following.
Condensing unit – outdoor unit
Indoor coil – housed in or near the furnace or air handler
Refrigerant line set to connect the coil in the condensing unit to the indoor coil
Refrigerant to fill the system, if the unit is not pre-filled or if the refrigerant line set is longer than usual.