The average cost of installing central air conditioning is $5,651; the typical range is $3,800 for smaller systems to $7,500 for larger or upgraded systems. Many factors influence the price, including the type of unit purchased, the size and energy efficiency of the unit, and the layout/structure of your home. Remember, each HVAC installation is different and the scope and cost of the job is driven by the needs and conditions of your individual home. An HVAC professional should inspect your home before installing a unit. A pre-installation appraisal can establish what size system you require, how well your home is insulated, and whether or not existing ducts and vents exist.