How Much Does it Cost to Install Central Air? Homeowners can pay between $ and $, for central air conditioning. The final cost will depend on the unit, additional installation items such as ductwork and the professional’s installation rates..Split System. Is made up of two units an outside unit, referred to as the condenser, and an inside unit, usually referred to as the “air handler”..I am considering replacing a ton AC unit with a . ton unit. The reasoning is that the unit’s job is to cool an area just over , square feet, and I must replace the unit either way..For a good, not necessarily top of the line,nd. Cost of compressor plus installation. For a bedroom average size ranch and ba.t. I live in.