Duplex with Utilities included in Rent

[Mike K.]

I'm looking at a older 2 story duplex with a unit on each level.  Property is priced right and there is a positive cash flow with an estimated $300/mo utility cost.  My concern is there are window AC units which could result in much higher electric bills in the summer.  Would you consider a rental duplex that doesn't have split utilities?  If so how much of a price discount would it take to account for the utility costs?  Any input would be greatly appreciated.