Keep the old boiler vs. all split system

Bklyntownhome

My wife and I are renovating an old (ca. 1910) 2500 sq. ft. town home in Brooklyn, NY. It's 2 stories plus a basement that we plan on finishing. We currently have what I've been told is likely an early 90's Crown boiler in the home. Please see the photo below.



The problem is this: My wife and I hate window AC units... so I've been looking at the split-system units offered by the likes of Sanyo (see here: <a href="http://us.sanyo.com:80/HVAC-Multi-Split-Systems">http://us.sanyo.com:80/HVAC-Multi-Split-Systems</a>) that offer both heating and cooling.



My question is: Would I be crazy to think I could heat and cool the home using split system units? Will it cost me a grillion dollars a month in electric bills?



Any thoughts/ideas/opinions would be greatly appreciated.



Thanks very much