Hello,I bought my property 3 months ago. Two of my vents arent getting air pushed through them from the AC unit (7 other vents are working fine and receiving air and the AC system works fine). The ducts are in the cei...

Many people automatically think electric resistance baseboards (or electrical coils in a central air-handler), but your ancillary heat could be easily fuelled with natural gas, propane, oil or another fuel.Presuming your use of "furnace" means a forced air furnace and not a boiler and hydronic heat, you have the option of adding a heat pump with an exchanger insert in the plenum of your existing ductwork.  

The tree has caused extensive damage; beams are coming down through the ceiling, the AC is leaking, duct work is coming through the ceiling, roof is damaged, etc. 

We have that first thing you posted, except that it was a professionally installed unit that was manufactured and it looks nicer than just open duct work as the area it is used in is a finished bedroom in the basement.

If the duplex has all the ductwork already (for furnace) then I would definitely add AC since it's not a very large expense.

It's had all electrical through to service replaced, new central air including duct work put in, new water heater, new roof, and literally a gut to the studs done to it.

Check if a single package unit is cheaper to install - it needs the space of a small closet and ductwork of course.

One furnace is shot and needs all new duct work.  

Not enough information to give you a guesstimate Does it have ductwork?

Originally, my rehab budget was about $63000 which included roof, siding, total redo on the inside, new furnace, air, and duct work (currently has old boiler system and no duct work) I had several companies say they wont do loans for less than $75000, so i increased my budget, opting for higher end counters, etc...