According to John Wagner of This Old House:

"When added to an existing forced-air heating system, central air for a 2,000-square-foot home costs $3,500 to $4,000 and can be done by two technicians in two to three days, often with little or no change to the ducting.

For a house that needs ducts, the costs and work time double. But a contractor experienced in retrofitting can cleverly hide ductwork behind walls, in the back of closets and up in the attic with minimal cuts into walls and the ceiling and very little mess."

So that means that you are looking at spending about $8,000 for central air.

More great information/tips can be found at: http://www.costhelper.com/cost/home-garden/central-air-conditioning.html

Good luck!
Source(s):
http://www.thisoldhouse.com/toh/article/0,,194722,00.html
http://www.costhelper.com/cost/home-garden/central-air-conditioning.html


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