Need HVAC Recommendation for 8 Plex

[Skye Coleman]

Hello there, first time posting, hoping you all can help.  My business partner and I just bought our first investment property, an 8-plex in KCK.  The building is now vacant, after a grueling 2 months of long work... but that's another story for another day. Regardless, we're in full rehab mode now, and that's why I need your advice.

The building currently has a single pipe, self-venting, boiler system fed off of a central gas line with a single temperature control in one unit.  But it's seen better days.  Many of the units are now missing the window AC units that were once in 2 rooms per unit, and several of the radiators (approximately 5 out of the 24) are gone too.  The electrical system is individually metered and I plan on having each of the new tenants take on those costs themselves.

So, what's the best option for me now?  

I'd love to provide both heating and cooling to the units and have the tenants pay for it, as much as is feasible.  Obviously, since this is our first deal, we're limited on our money to put into the system.  We budgeted $10K for a new boiler, but I don't know if this is the best choice going forward. 

It should also be known that it's not unusual for units in the area we're investing to use window units for cooling.  

Let me know if there's anything else you need to know.