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..Buying an HVAC system for new home construction, a re.ing project, or to upgrade or replace an existing system is a costly project. Knowing an estimate of what your HVAC installation cost is going to be ahead of time can help save you money and ensure that you purchase a system that will adequately accommodate the square footage of your home..Quite a few visitors have been coming in lo.ng for system reviews, so I thought I would start a new series of posts, geared around specific units, and reviewing why you may or may not, want to install them..Learn all about HVAC system costs. Read general heating, ventilation and cooling prices and get free HVAC estimates. CostOwl.com.