Central air ROI in CT

[Stephen R.]

I am changing the heating system from oil to natural gas in my current flip. I budgeted for, and included, a new furnace in my original SOW. I'm now considering adding central a/c as part of that process. The home has existing duct work and I was quoted $3,700 total for the install which would include a new 92% HE furnace. 

It seems like a no-brainer to me but I'm looking for someone to weigh in on how much of a difference it would make in the final sale price, or potential reduction of DOM, in a place like southwestern Connecticut, Fairfield County.

The second part of this question is: if I hire the HVAC company to do the install, including the furnace, how do I adjust the original SOW and deduct the cost from the HIC?