Central Air Installation

[Spenser Murphy]

A lot of the properties in my price range have window AC units. I was curious how much contractors charge for a central AC retrofit. Should I even bother since I want to eventually rent the property? I feel central air would value. I know these will be ball park estimates. I'm know there are many variables. I priced 4 ton units between $1.5-2k. Any estimates or suggestions would be appreciated.